The EU has declared three leaks in two Russia-Germany gas pipelines to be the work of sabotage and suspicion has fallen on Russia.
Some commentators have suggested the leaks are linked to the Ukraine war, though the Kremlin has described the accusations it was behind them as “predictable” and “stupid”.
Here is what we know about what happened to Nord Stream 1 and 2, who could have been responsible and what’s being done about it.
What happened and where
On Monday morning, at around 2am local time, bubbles are thought to have started erupting on the surface of a section of the Baltic Sea between Sweden and Poland, about 14 miles (23km) southeast of Denmark’s Bornholm Island.
That morning, it was reported that pressure in the Nord Stream 2 pipeline had dropped overnight from 105 bars to 7 bars, indicating a leak.
The Nord Stream 2 pipe runs for 764 miles (1,230km) from Russia through the Baltic Sea to Germany and had been due to carry billions of cubic feet of gas to Europe until Russia invaded Ukraine and Germany refused to grant the pipeline’s operators a licence, leaving it mothballed.
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Denmark scrambled military aircraft to look for signs of a leak and identified an area of disturbed sea, which they designated a danger to shipping.
The time of the leak was confirmed by readings taken by seismologists in neighbouring countries, who registered the equivalent of an earthquake magnitude of 1.8, which they triangulated to have occurred at almost exactly the same spot as the leak was bubbling to the surface.
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About 17 hours after the Nord Stream 2 reading was taken, a second reading was recorded by seismologists northeast of Bornholm, indicating another incident.
Shortly after, Nord Stream AG, the operator of the Nord Stream 1, said it was looking into causes of a drop in pressure in the pipeline.
Again, seismologists’ readings located the incident to a specific location – around 34 miles (55km) northeast of Bornholm Island.
The following morning, Sweden’s Maritime Authority issued a warning of two leaks in the Nord Stream 1 pipeline in its and Danish waters, bringing the total number of leaks to three.
Nord Stream 1 follows a similar but not identical route from Russia to Germany and had been used to ship Russian gas to Europe since 2011, until the outbreak of the Ukraine war.
As Europe reeled from the Vladimir Putin’s invasion, it moved to reduce its reliance on gas from Russia, and simultaneously, flows through Nord Stream 1 to Europe from Russia decreased until no gas was flowing through the pipeline.
Footage from the scene taken from a Danish plane showed frothy seas, up to a kilometre wide.
What do the experts say
Initially, the European countries nearby were cautious, saying investigation was needed to find out what had happened.
The operator of the pipelines said the leaks were “unprecedented”, but did not have an explanation for them.
The Kremlin was quick to say sabotage could not be ruled out.
In the course of Tuesday, seismologists who had recorded the incidents said their analysis indicated the tremors had been caused by explosions.
Bjorn Lund, director of the Swedish National Seismic Network, said: “There’s no doubt, this is not an earthquake.”
By Wednesday, many politicians were adamant that the damage to the pipes was caused by human activity and deliberate, rather than because of earthquakes or accidental.
Danish defence minister Morten Bodskov said on Wednesday: “Our assessment is… that the breakage on the pipes is not an accident but a deliberate act.”
Image: The Danish and Swedish military have been observing the bubbling at the surface. Pic: Swedish Coast Guard
Who was responsible
Very early on, suspicion fell on Russia. A number of commentators asked who would profit from such ruptures in the pipelines, noting how it had the potential to affect gas prices.
Ukraine blamed Russia immediately, with presidential adviser Myhailo Podolyak saying the leak was “a terrorist attack planned by Russia and an act of aggression towards the EU”, without offering any evidence.
Gas prices soared again on Monday, largely in reaction to a threat from Moscow to sanction Ukrainian energy firm Naftogaz, raising the possibility that one of the last functioning Russian gas supply routes to Europe would close down.
But many expressed disbelief that Russia would target infrastructure that carried gas that it had sold, threatening its future revenues. Kremlin spokesman Dmitry Peskov called such accusations “predictable and… stupid”.
Yet there has been much speculation that an attack by Russia on the pipelines could be a warning to the West not to escalate the Ukraine war further.
This is because the pipelines were not operational at the time and they supplied Russian gas, so would be less likely to be seen as a further significant provocation.
Russia has been becoming increasingly frustrated that Western supplied weapons have been helping Ukraine resist Moscow’s invasion.
On Tuesday Poland’s President Andrzej Duda symbolically opened the valve of a yellow pipe belonging to the Baltic Pipe, a new system sending Norwegian gas across Denmark and the Baltic Sea to Poland, which he hailed as ending “Russian domination in the gas sphere”.
Some commentators have pointed out that while the gas leaks erupted in Denmark and Sweden’s Exclusive Economic Zones, they were outside their territorial waters, and therefore could be classed as having happened in international waters, making retaliation more complicated.
Others have cited the fact that there are significant networks of piping under the North Sea that could be vulnerable to attack. If the cause of the leaks is proven to have been an attack, it would reveal the ease with which undersea infrastructure can be targeted.
The method used by any potential saboteurs is far from clear. Russia has submarines which Western experts say are equipped to attack international internet cables, but there are suggestions the vessel was out of range at the time. Others say deep sea divers, travelling from the nearby Russian exclave of Kaliningrad, could have planted a device.
How will we find out
Experts say they expect that navies from surrounding countries will send teams with specialist experience into the area to carry out investigations.
Mr Bodskov said the Danish military had increased its presence within and around the area of Bornholm and they would be “doing everything within their power to get this clarified which is happening in close collaboration with our partners”.
But he said it may take some weeks.
“If you listen to the experts about how much gas there is the pipes and how long it will take before the pressure drops, then the reality is that might take a week, 14 days before it is calm enough in the area to actually see what has happened,” he added.
Any investigation is likely to look closely at damage to the pipes, which, at around 1,153mm in diameter with 34mm thick steel walls, surrounded by, in some cases, more than 110mm of concrete, would be difficult to crack.
Image: Investigations are likely to look at damage to the pipe which is 34mm thick steel and covered, when underwater, with more than 100mm of concrete
Peter Faulding, one of the foremost British underwater forensic investigators, whose Specialist Group International has been involved in numerous undersea investigations carried out by UK police, said he expects the initial investigation to involve remotely operated vehicles (ROVs), which are also known as drones.
“People will be very wary about putting divers near it because… you’ve got a large amount of gas coming out,” he told Sky News.
“I would say they’d be using remote operated vehicles to go down. An ROV, because they have manipulators on the front. If there was any debris, the manipulator… can retrieve the evidence and an ROV will give crystal clear pictures without putting a diver in jeopardy.
“A lot them are autonomous now. They can send them down without a cable and they can actually pick things up off the sea bed.
“You would see what it was. If it was done with explosive, it will be very rough. There’ll be residues. There’d be fragments.“
“From that, they can carry out appropriate forensic tests to see what explosive it was, if an explosive has been used.”
Mr Faulding, who has previous military experience and carries out consultancy work for the energy industry, said once it was safe, because the pipelines are at a depth of about 70m, the navies would probably put down divers operating out of a diving bell, but they would have to breathe a special mixture and would work in a similar way to those who carry out work on undersea oil facilities.
He said it should not be difficult to work out which explosive, if any, had been used, but it would be extremely difficult, if not impossible, to work out who carried out an attack.
What are the consequences
In the immediate aftermath, European leaders expressed concern and said they would work to find out what had happened.
The gas markets remained volatile, but experts said that much of Tuesday’s volatility was due to fears that Russia would stop shipping gas through Ukraine, rather that because of the possibility of an attack on Nord Stream 1 or 2.
Nonetheless, experts said that the leaks had added to the uncertainty that has been fuelling much higher gas prices this year than in previous years.
Image: Norway has a substantial gas and oil industry network across the North Sea, supplying much of Europe
Gas analyst Tom Marzec-Manser told Sky News: “The market opened bullishly yesterday in response to the Nord Stream stuff. But then it jumped significantly when that Ukraine development happened, when Gazprom threatened the sanctions. That actually was a larger wedge of the gains yesterday. But it’s definitely all part and parcel of the… loss of yet more Russian gas (being) the main driver to a 27% jump yesterday in wholesale prices.”
Despite doubts in the gas industry that any potential attacks could spread, Norway’s state oil company, Equinor, said it would raise its level of preparedness.
The alert was raised overnight and applies to all of Equinor’s facilities.
Norway is a major producer of offshore oil and gas and its energy exports have surged as European countries scramble to find alternatives to Russian energy supplies.
Norwegian Prime Minister Jonas Gahr Store said: “We are concerned with taking good care of the safety of our own oil and gas installations, and we have stepped up the state of preparedness regarding them today.”
Royal Norwegian Navy officer Lieutenant Commander Tor Ivar Strommen warned that there could be attacks on Norwegian energy exports “in the next half year”.
NATO and the European Union stressed the need to protect critical infrastructure and warned of a “robust and united response” should there be more attacks.
Mr Strommen told Reuters: “The Norwegian government has to realise that by far the most important strategic object in all of Europe now is the energy or gas imports from Norway.
“If those deliveries should be cut or stopped or reduced by a large amount, this would cause a complete energy crisis in Europe.”
The White House has hit out at an “appalling” attempt by a Democratic senator to return a father wrongly deported to El Salvador.
Chris Van Hollen arrived in El Salvador on Wednesday to speak to the country’s leaders about Kilmar Abrego Garcia, who was removed from the US by the Trump administration in March despite an immigration court order preventing his deportation.
Washington acknowledged Mr Garcia was deported due to an “administrative error”.
The US Supreme Court has called on the administration to facilitate his return, upholding a court order by Judge Paula Xinis, but Trump officials have claimed Mr Garcia has ties to the MS-13 gang.
Mr Garcia’s lawyers have argued there is no evidence of this.
Speaking about Mr Van Hollen’s trip to El Salvador, White House spokesperson Karoline Leavitt said the Democrats “still refuse to accept the will of the American people”.
She alleged Mr Garcia was an “illegal alien MS-13 terrorist” and claimed his wife petitioned for court protection against him after alleged incidents of domestic violence.
Image: White House press secretary Karoline Leavitt.
Pic: AP/Jose Luis Magana
After outlining the allegations against Mr Garcia, she went on: “All of that is not enough to stop the Democrat Party from their lies.
“The number one issue they are focused on right now is bringing back this illegal alien terrorist to America.
“It’s appalling and sad that Senator Van Hollen and the Democrats are plotting his trip to El Salvador today, are incapable of having any shred of common sense or empathy for their own constituents and our citizens.”
After making a statement, Ms Leavitt introduced Patty Morin, who described graphic details of her daughter’s murder by an immigrant from El Salvador.
Rachel Morin was raped and murdered by Victor Martinez-Hernandez along a popular hiking trail northeast of Baltimore.
Afterwards, Ms Leavitt left without taking any questions from reporters.
Image: Kilmar Abrego Garcia. Pic: CASA/AP
Senator travels to El Salvador
Mr Van Hollen met with the El Salvador vice president during his trip to the Central American country.
But he did not meet with President Nayib Bukele, who publicly met with Donald Trump in the Oval Office this week, nor did he meet Mr Garcia himself.
Image: US senator Chris Van Hollen has been in El Salvador.
Pic: Reuters/Jose Cabezas
In a post on X, he said he would continue to fight for Mr Garcia’s return.
During Mr Bukele’s trip to the White House earlier this week, he said he would not return Mr Garcia, likening it to smuggling “a terrorist into the United States”.
Along with Mr Garcia, the Trump administration has deported hundreds of people, mostly Venezuelans, who it claims are gang members without presenting evidence and without a trial.
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‘I’m talking about violent people’
Judge’s contempt warning
It comes hours after a US federal judge warned that he could hold the Trump administration in criminal contempt for violating his orders to turn around planes carrying deportees to El Salvador.
The comments are an escalation in a row which began last month when US district judge James E Boasberg issued an order temporarily blocking the deportations.
However, lawyers told him there were already two planes with immigrants in the air – one headed for El Salvador, the other for Honduras.
Mr Boasberg verbally ordered the planes to be turned around, but the directive was not included in his written order. The Trump administration then denied refusing to comply.
Charges could be brought forward by the Justice Department, NBC News, Sky’s US partner network, reported.
However, that could create an uncomfortable situation for the department, which is headed by the attorney general – a position appointed by the president.
If the executive-led Justice Department refused to prosecute the matter, Judge Boasberg said he would appoint another attorney to prosecute the contempt.
The judge wrote: “The Constitution does not tolerate wilful disobedience of judicial orders – especially by officials of a coordinate branch who have sworn an oath to uphold it.”
He gave the government a 23 April deadline.
White House director of communications Steven Cheung said the administration would seek “immediate appellate relief” – a review of a decision within a lower court before the case has been resolved.
Israel’s troops will remain in “security zones” in Gaza, Lebanon and Syria indefinitely, according to the country’s defence minister.
Israeli forces have taken over more than half of the Gaza Strip in recent weeks in a renewed campaign to pressure the territory’s rulers Hamas to free hostages after a ceasefire ended last month.
Israel has also refused to withdraw from some areas in Lebanon following a truce with Hezbollah last year, and it seized a buffer zone in southern Syria after President Assad’s regime was overthrown last December.
Israeli defence minister Israel Katz said his forces “will remain in the security zones as a buffer between the enemy and [Israeli] communities in any temporary or permanent situation in Gaza – as in Lebanon and Syria”.
He said that “unlike in the past” the military was “not evacuating areas that have been cleared and seized”.
His comments could further complicate talks with Hamas over a ceasefire and the release of hostages.
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Gazans struggle to find bodies under rubble
On Wednesday, health officials said Israeli strikes in Gaza killed 22 people, including a girl who was less than a year old.
Fifty-nine hostages are still inside Gaza, 24 of whom are believed to be alive, after dozens of others were previously released in ceasefire agreements or other deals.
Image: Israeli defence minister Israel Katz. Pic: AP
Meanwhile, Lebanese President Joseph Aoun said Israel’s continued presence in some areas in Lebanon was “hindering” the Lebanese army’s full deployment as required by the ceasefire negotiated with Israel.
The war left over 4,000 people dead, many of them civilians.
Two Israeli drone strikes in southern Lebanon on Wednesday killed two people, the health ministry said. The United Nations said Israeli strikes in Lebanon have killed more than 70 civilians since the ceasefire took effect in November.
Israel has said it must keep control of some areas to prevent a repeat of the Hamas attack that triggered the latest conflict in Gaza.
The war began when militants attacked southern Israel on 7 October 2023, killing 1,200 people, mostly civilians, and kidnapping about 250.
Israel’s retaliatory offensive has killed more than 51,000 people, according to Gaza’s health ministry.
The figure includes more than 1,600 people killed since a ceasefire ended and Israel resumed its offensive last month to pressure Hamas to accept changes to the agreement.
The health ministry does not distinguish between civilians and combatants in its total count but said that more than half of the fatalities are women and children.
It was in the evening that the bombing started to intensify.
Salah Jundia, his father and brothers huddled together in their home in Shujaiyya, just east of Gaza City, trying to work out what to do.
It was too risky for them to leave at night. There were a lot of them too. Extended family living across four storeys. They decided they would wait until after dawn prayers.
The explosion tore through the building just before 5am, collapsing one storey on to the next.
Image: The aftermath of Israel’s bombing campaign in Shujaiyya, just east of Gaza City
Image: Salah Jundia
Jundia says he survived because pieces of bedroom furniture fell on top of him.
Then he looked for his father and brothers.
“I found one of them calling for help. I removed the rubble covering him with my hands. Then I saw another brother covered in rubble but he was dead,” he told Sky News.
Jundia added: “My father was also dead. My other brother was also dead. We got them out and that is when I saw that the whole building had collapsed.”
Over the next few hours, they scrambled to rescue who they could.
An aunt and uncle and one of their children, Shaimaa. Uncle Imad and his son Mohammad. The bodies of Montasir and Mustaf.
Image: One of the child victims of the attack on the home near the Gaza City
Image: Another one of child victims of the attack
Jundia says he could hear cries for help, but they were coming from deep in the rubble and were impossible to reach.
The rescue teams on site – civil defence they are called – did not have the kit to clear through three floors of 500 square metres, 30cm slabs of concrete.
Image: Rescuers drilling to try and reach the people trapped below the rubble
Image: Efforts to free those trapped beneath the rubble near the Gaza City
In the afternoon, Jundia says Israel’s Defence Forces (IDF) told rescue teams to leave as they would be resuming their bombardment.
Jundia buried the bodies he had managed to pull out but he knew 15 of his family members, 12 of them children, were still somewhere inside the rubble, still crying for help.
He made a desperate video appeal, begging the Red Cross and Arab countries to pressure Israel to grant access to the site. It was picked up on a few social media accounts.
Israel won’t allow heavy equipment into Gaza. No diggers or bulldozers, nor the fuel or generators to run them.
They say it will fall into Hamas’s hands.
It was a major sticking point during the ceasefire and it is a major issue now as the bombardment continues, given the fact that hundreds if not thousands of civilians might survive if there were the equipment to extract them.
Image: Members of Salah Jundia’s family left alive after the attack
Image: Salah Jundia and his surviving family
Civil defence trying to get to the Jundia family home over the next few days were halted because the IDF were in the vicinity. A family friend tried himself and was killed.
The footage that our camera teams have shot in Shujaiyya over the past two weeks shows how civil defence teams struggle to save those who are trapped and injured with the most rudimentary of equipment – plastering trowels, sledgehammers, ropes and small drills.
“The tight siege stops civil defence equipment from getting in,” says one.
They added: “So we are taking much longer to respond to these events. Time is a factor in getting these people out. So we call immediately for the necessary equipment to be allowed in for the civil defence to use.”
The IDF say they are investigating the circumstances around the Jundia family as a result of our enquiries.
In relation to the access of heavy equipment into Gaza, they say they work closely with international aid organisations to enable the delivery of humanitarian activities in accordance with international law.
The last contact Jundia had from beneath the rubble was a phone call from his uncle Ziad, three days after the strike.
“The line was open for 25 seconds then it went dead. We don’t know what happened. We tried to call, but there was no answer,” he says.
He and his family were displaced several times before they returned home to Shujaiyya – to Rafah in the south, then Khan Younis and Deir al-Balah.
Along the way, Jundia lost one brother and a nephew to Israeli bombs.
“We were happy and all the family came back. We went back to our house. It was damaged, but we improvised and we lived in it. We have nothing to do with the resistance. We are not interested in wars. But we have been gravely harmed,” he says.