In an era of orbital satellites so advanced that they are able to make out objects half the size of cars from space, a spy balloon might seem like a bit of a relic.
They were a prominent tool for reconnaissance during the Cold War and were even used in a more basic form for intelligence gathering in the Napoleonic Wars more than 200 years ago.
But security experts say the balloons are just the “tip of a revolution” in the development and use of new high-altitude surveillance craft, with the UK even investing millions in a project to develop spy balloons last year.
It comes as the US military on Friday said it was tracking a suspected Chinese spy balloon, described as being the size of three buses, that has been flying over northwestern America in recent days.
A senior defence official said the US has “very high confidence” it is a Chinese high-altitude balloon and was flying over sensitive sites to collect information, while China has not immediately denied the balloon belonged to them.
Beijing admitted that the balloon had come from China, but insisted it was a “civilian airship” that had strayed into American airspace and that it was for meteorological and other scientific research.
US Secretary of State Antony Blinken is postponing a high-profile visit to China which had been due to begin on Sunday.
What are spy balloons?
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The devices are lightweight balloons, filled with gas, usually helium, and attached to a piece of spying equipment such as a long-range camera.
They can be launched from the ground and are sent up into the air where they can reach heights of between 60,000ft (18,000m) and 150,000ft (45,000m), above the flight paths of commercial aircraft in an area known as “near space”.
Once in the air, they travel using a mixture of air currents and pressurised air pockets, which can act as a form of steering.
Why are they still useful in the satellite era?
According to defence and security analyst Professor Michael Clarke, the biggest advantage of spy balloons over satellites are that they can study an area over a longer period of time.
“The advantage is they can stay in one place for a long time,” he told Sky News.
“Because of the way the Earth rotates, unless a satellite is over the Equator, you need three to five satellites going all the time to track the same spot.
“These balloons are also relatively cheap, and much easier to launch than a satellite.”
Will balloons continue to be used in future for spying?
Very much so, according to Professor Clarke.
Despite the wide use of satellite technology, countries including the UK are also focusing on the development and use of spycraft to operate in the upper atmosphere.
In August, it was announced the Ministry of Defence had agreed a £100m deal with US defence company Sierra Nevada to provide high-altitude unmanned balloons to be used for surveillance and reconnaissance.
Professor Clarke said: “(These balloons) are the very tip of the revolution for passive upper atmosphere aircraft.”
He said other defence firms, such as BAE, were working on ultralight solar-powered drones which are able to operate in the upper atmosphere and stay in place for up to 20 months.
Why have China used them now?
According to Professor Clarke, the use of these balloons, if indeed they were launched by China, will likely have been a message to the US following its decision to open new military bases in the Philippines.
“I think it’s a challenge,” he said.
“They (China) are signalling that if the US is going to come closer to them then they will be more aggressive with their surveillance.
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“It is also caused a political issue in the US now, because it will be seen as a sign of weakness not to shoot it down.
“This causes some embarrassment, but the US doesn’t need to respond.”
The balloon was spotted over Billings, Montana,on Wednesday – close to one of the US’s three nuclear missile silo fields at Malmstrom Air Force Base.
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Mao Ning, a Chinese foreign ministry spokesperson, says that those involved should be ‘cool-headed’
Military and defence leaders said they considered shooting the balloon out of the sky but decided against it due to the safety risk from falling debris.
Professor Clarke added: “I think the debris issue is a bit of an excuse. It was over one of the least densely populated areas of the US and if they needed to they could have asked everyone to stay inside.
“I don’t think they wanted to make it a bigger issue, because China are daring them to shoot it down and make it an international issue.”
Chaos engulfed campuses across the United States as pro-Palestinian student protests spread to universities across the length and breadth of this country.
At the University of Southern California in Los Angeles at least 93 people were arrested during a volatile three-hour standoff between protesters and the police.
One young woman, wearing an Arab scarf, threw a bottle of water at officers and was tackled to the ground before being handcuffed and taken to a waiting police van.
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Heavily armed officers were sent to disperse pro-Palestine student activists who are calling for a ceasefire in Gaza.
Others, who had formed a protest circle after police issued a dispersal order, were handcuffed one by one and frogmarched off campus by Los Angeles police officers.
The day had started relatively peacefully as hundreds of students gathered on the main lawn on campus.
Police did intervene to remove a number of tents that had been erected, but people holding signs which called for a ceasefire in Gaza soon filled the space.
As classes finished for the day, police issued a dispersal order, telling protesters over a loudspeaker that they had 10 minutes to clear the area or they would be arrested.
A group of at least 50 students remained, linking arms and chanting, “free, free, Palestine”. Some used a black marker pen to scribble on their arms the number of a helpline to call from prison.
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“Are you scared of being arrested?” I asked one young woman. “No,” she replied. “I think the children in Gaza are more scared than me.”
I asked another why she feels so passionate about taking a stand on a war unfolding more than seven thousand miles away. “We know that we’re on the right side of this right now,” she said, “and if we’re not going to do this, then who is?”
The students here say they have two core aims. They are demanding that their university cuts all financial ties with Israel and that their country stops sending them weapons.
Amid the peaceful chants are potentially inflammatory songs about the state of Israel.
I asked one young man if he is concerned Jewish students may feel threatened and isolated on their own campus.
“None of the chants or anything that we’ve said is inherently antisemitic,” he said, “nor is the call for the liberation of Palestine inherently antisemitic”.
A dolphin has been found shot dead on a beach, prompting officials to offer a reward for information.
A member of the public discovered the bottlenose dolphin at the beach near New Orleans, Louisiana, the National Oceanic and Atmospheric Administration (NOAA) said.
The aquatic mammal was recovered by Audubon Aquarium Rescue, which carried out a necropsy that revealed “multiple bullets lodged in the carcass, including in the brain, spinal cord, and heart”.
“The animal appeared to have died from the trauma, which occurred at or near the time of death,” the NOAA added.
The NOAA is now offering a reward of $20,000 (£16,000) for information leading to a criminal conviction or the assessment of a civil penalty, following the discovery on 13 March.
Harassing, harming, killing, or feeding wild dolphins is prohibited in the US under the Marine Mammal Protection Act.
People found to have violated the laws can be prosecuted civilly or criminally, with sentences of up to a year in prison and $100,000 (£80,000) in fines.
Scientists say bottlenose dolphins are highly intelligent, and have been observed to demonstrate self-awareness, problem-solving, empathy, innovation, teaching skills, grief, joy and playfulness.
The drive into the village of Jiljiliya is not what you expect on the West Bank. Imposing mansions line the route, with grand gates and lavish decorations.
That’s because this is where Palestinian Americans return to build their dream homes after years of hard work in the land of opportunity.
Like Omar Assad who came back after 45 years in Milwaukee. But for him, retirement was neither long nor happy. It was cut brutally short one freezing night in January 2022.
He was returning from a game of cards when he was stopped at a makeshift checkpoint set up by the notorious Israeli army unit, Netzah Yehuda.
The IDF says he did not cooperate so the 78-year-old was detained with force.
Mraweh Mahmoud was with him.
“They took us down from the car and pushed me by the head,” he told Sky News. “The soldier was standing there and put an M16 in my head and said now I’ll shoot you.”
Mr Assad was tied up, gagged and blindfolded, Mr Mahmoud said, and forced to lie next to him. When the soldiers eventually left Mr Mahmoud realised Mr Assad was dead.
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“I took his jacket off his head, I checked there’s no pulse, I shouted Omar, Omar,” he said.
Palestinian doctors say Mr Assad died in freezing temperatures of a stress-induced heart attack. An Israeli military report condemned the soldiers’ “moral failure and poor decision-making”.
No link between death and soldiers’ errors, military prosecutors say
Netzah Yehuda’s battalion commander was reprimanded and two officers were dismissed but Israeli military prosecutors decided against pursuing criminal charges because they said there was no link between the errors made by soldiers and Mr Assad’s death.
But now the unit the soldiers came from is expected to be singled out by the US government and cut off from American funding, in the first-ever such move against any part of the Israeli military.
Reports claim the US State Department will apply the so-called Leahy Law against the unit, which prohibits US assistance to foreign military units guilty of gross human rights violations when their government fails to take sufficient action.
Why has Netzah Yehuda become infamous?
The Netzah Yehuda battalion was set up to help ultra-orthodox Jews serve in the army. It mixes religion and soldiering. But in its ranks are also elements of extremist settler groups.
It has become infamous, implicated in one case of alleged abuse of Palestinians after another, many of which its soldiers have filmed on their own phones. Its soldiers have been prosecuted for human rights violations and accused of unlawful killings, electrocution, torture and sexual assault.
Israel’s government has fought a rearguard action against the looming US action.
Its prime minister called the prospect absurd and its defence minister Yoav Galant showed solidarity with the battalion’s soldiers this week saying “no one in the world can teach us about morals and values”.
But one organisation of ex-soldiers opposed to Israel’s occupation of Palestinian territories says the Israeli government knows this could be just the beginning of action against its military.
‘They’re terrified of the possible results’
Ori Givati from the NGO Breaking the Silence told Sky News: “They understand that this might open the Pandora’s box of what the occupation really is, and how it looks like to occupy millions with the military.
“And if that Pandora’s box will be opened and it is starting to open in recent months, I think they’re terrified of the possible results because they want to continue to occupy.”
Back in Jilijilya, Mr Assad’s family welcomes reports America will act against the soldiers they blame for his death but say that’s not enough – they want them brought to justice too.
Nazmia, Mr Assad’s widow, said: “God willing it will be good if they do this, but also punish them like what they did with him, arrest them and fire them from their positions.”