The Nord Stream pipeline network, part of which supplies Germany with gas from Russia, has been damaged in three places, its operator has said.
The damage to the system on the bed of the Baltic Sea – all caused in one day – was “unprecedented”, Nord Stream AG added.
The Kremlin said it could not rule out sabotage as a cause of the damage, while other authorities are investigating.
The Danish energy authority also said it could be a deliberate act, as any event like this was “extremely rare”.
And a European security source told Reuters: “There are some indications that it is deliberate damage. You have to ask: Who would profit?”
Meanwhile, a reading from a nearby seismograph, which records vibrations on the planet’s surface, was later found to show spikes at similar times to when the losses in pressure in the pipes were first recorded, according to a German geology research centre.
Sweden’s national seismology centre said its measurement stations recorded “powerful subsea blasts” in the area where the gas leaks occurred.
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Seismologist Bjorn Lund told public broadcaster SVT: “There is no doubt that these were explosions.”
Earlier, Sweden’s Maritime Authority had issued a warning about two leaks in the Nord Stream 1 pipeline, which until the Ukraine war provided about 60% of Germany’s gas needs.
On Monday, Denmark issued a warning about a leak in the yet-to-be-opened Nord Stream 2 pipeline, which had been built to boost the amount of Russian gas supplied to Germany.
The leak from Nord Stream 2, southeast of the Danish island of Bornholm in the Baltic Sea, prompted the setting up of a five nautical mile exclusion zone, to protect shipping from any danger.
The Danes have now marked off the leak from Nord Stream 1, which is also near Bornholm.
Denmark’s energy authority added it expected the leak will continue for several days and perhaps even a week.
Nord Stream AG said it was impossible to estimate when the gas network system would be working again.
“The destruction that occurred on the same day simultaneously on three strings of the offshore gas pipelines of the Nord Stream system is unprecedented,” it said.
“It is not yet possible to estimate the timing of the restoration of the gas transport infrastructure.”
Nord Stream 1’s twin undersea pipelines opened in 2011, with the ability to supply up to 27.5 billion cubic metres of gas a year each.
Despite not carrying gas to Germany and beyond, both pipelines have apparently remained full of gas, which is now leaking into the sea.
It was not immediately clear what consequences would follow, especially as methane in the atmosphere is a driver of climate change. The EU Commission said it would analyse the potential impact.
German environmental group Deutsche Umwelthilfe said any effects from an explosion would be local and that some gas would dissolve in the sea.
On Tuesday, a ceremony was due to be held to inaugurate a new pipeline, Baltic Pipe, to carry Norwegian gas through Denmark to Poland, which it is hoped will ease some pressure on European gas supplies.
Israeli Prime Minister Benjamin Netanyahu has rejected ceasefire proposals because he says Hamas’s call for a withdrawal of all troops from Gaza and an end to the war is unacceptable.
Mr Netanyahu said agreeing to such proposals would “leave Hamas intact” and leave the possibility of another attack in future.
“Surrendering to the demands of Hamas would be a terrible defeat for the State of Israel,” he said in a video statement.
Mediated negotiations for a pause in the fighting in return for the release of hostages held by Hamas have been going on in Egypt, but a deal still appears some way off.
Hamas said in a statement on Sunday it’s “still keen to reach a comprehensive, interconnected agreement that ends the aggression, guarantees withdrawal, and achieves a serious prisoner exchange deal”.
The proposal mediators had put to Hamas set out a three-stage process for an immediate, six-week ceasefire and partial release of Israeli hostages, with some sort of Israeli pull-out in exchange.
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More than 34,600 Palestinians have been killed and more than 77,000 have been wounded in Israel’s military operation, according to Gaza’s health ministry.
Israel has said it remains committed to a ground offensive in the southern city of Rafah, where more than a million have fled in search of safety, as it tries to wipe out Hamas.
The UN and others have warned of catastrophe if it goes ahead.
The war began in October after Hamas killed about 1,200 people, according to Israeli figures, when it launched a surprise attack.
More than 200 were abducted and many remain as hostages, while others are thought to have died.
Countries in South and Southeast Asia have been coping with a weeks-long heatwave which has seen record temperatures sweep parts of the region.
Pupils in the Philippines, India and Bangladesh have been told to stay at home and learn remotely due to a severe health risk.
Schools in Cambodia have also cut back on their hours.
Cambodia faces its hottest temperature in 170 years, according to meteorologists – as high as 43C (109F).
Bangkok in Thailand has reached 40C (104 F), but the heat index is said to have topped 50 C (122 F) due to the heat being trapped among the mass of buildings.
The United Nations Children’s Fund warned in April that the heat could put the lives of millions of children at risk and asked people who care for them to take extra precautions.
A spokesperson for UNICEF said around 243 million children were exposed to hotter and longer heatwaves.
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They said the increased heat was “putting them at risk of a multitude of heat-related illnesses, and even death”.
Thirty people in Thailand have died from heatstroke in the past month, according to data from the country’s health ministry.
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People are being advised to avoid outdoor activities and to stay hydrated.
Several towns in Myanmar were included on lists of the hottest spots globally last month, with temperatures reaching 48.2C (118F) in at least one case.
Parts of eastern India also experienced their hottest April on record.
Kerala, on India’s west coast, this week instructed all schools and colleges to close until Monday, while influencers in Bangladesh have encouraging people to plant trees in response to the record heat.
Benjamin Horton, director of the Earth Observatory of Singapore, said there were three factors for heatwaves: a naturally-occurring climate phenomenon known as El Nino, an increase in global temperatures, and human-induced climate change.
Philippine coastguard spokesman Jay Tarriela told Sky News that this week’s confrontation was the first time China had used “such aggression” against their ships.
“The metal parts and the railing were bent. The canopy was also destroyed. So this came as a surprise for us that China never hesitated to use brute force,” he said.
“It completely justifies us calling The People’s Republic of China a bully country.”
The Philippine coastguard was on a resupply mission to the Scarborough Shoal to deliver food and fuel to Philippine fishermen when they were struck.
The submerged reef lies in disputed waters. China claims sovereignty over the reef but it is much closer to the Philippines and lies within its legally recognised exclusive economic zone.
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The vessel Sky News was on board was the closest the coastguard had ever been to the shoal – just 600 metres away from it.
Asked if the mission to the shoal was a provocative move by the Philippine coastguard, Commodore Tarriela denied they were “poking the bear” but rather “driving the bear out of our own territory”.
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Sky witnesses China-Philippine confrontation
The Philippines has been stepping up its patrols in the area under the instruction of President Bongbong Marcos, and reasserting its claim to the shoal in recent months.
It has raised the spectre of open conflict. While neither side currently wants that, there is now a greater threat of open conflict.
Asked what the end game was for the Philippines, Commodore Tarriela said their priority was to “tell the world” about China’s aggression.
He said their secondary goal was to ensure “like-minded states” also made China “fall in line and respect international law”.
Philippine government policy is not to resist using water cannon against Chinese vessels – and Commodore Tarriela insisted that policy remains in place after the confrontation.
The government also remains intensely determined to protect the waters it believes it has every right to operate in.
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“We’re not going to yield and we’re not going to surrender a square inch of our territory,” Commodore Tarriela insisted.
Beijing has called the action its own coastguard took as “necessary”.
Speaking at the Chinese foreign ministry’s daily news conference, spokesperson Lin Jian described the coastguard’s conduct as “professional, proper, and lawful”.