It flew over the Aleutian Islands, off the coast of Alaska, and through Canadabefore entering the US.
The balloon is still in US airspace but officials declined to say where it is now.
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They acknowledged it was operating above civilian air traffic and below “outer space”, but declined to say how high it was flying.
Military and defence leaders have considered shooting the balloon out of the sky but decided against it due to the safety risk from falling debris.
US defence secretary Lloyd Austin convened a meeting of senior military and defence leaders to review the threat profile of the balloon and possible responses, which were presented to US President Joe Biden on Wednesday.
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2:17
US tracks suspected Chinese balloon
The US has engaged Chinese officials “with urgency” and communicated the seriousness of the situation.
Pentagon press secretary Brigadier General Patrick Ryder said: “The United States government has detected and is tracking a high-altitude surveillance balloon that is over the continental United States right now.
“The US government to include NORAD (North American Aerospace Defence Command), continues to track and monitor it closely.
“The balloon is currently travelling at an altitude well above commercial air traffic and does not present a military or physical threat to people on the ground.
“Instances of this kind of balloon activity have been observed previously over the past several years.
“Once the balloon was detected, the US government acted immediately to protect against the collection of sensitive information.”
China and the US have experienced tensions of late, clashing over Taiwan and China’s human rights record and its military activity in the South China Sea.
US Secretary of State Antony Blinken is expected to travel to China in the coming days.
It is not clear if this will affect his travel plans, which the State Department has not formally announced.
Spy balloon threatens efforts to ease US-China relations
Distrust between the Chinese and the Americans is as high as it’s been for decades.
An incident like this would serve to feed that distrust no matter when it happened, but coming, as it has, just days before Secretary of State Antony Blinken’s highly significant visit to Beijing could seriously undermine tentative efforts being made on both sides to try to halt any further deterioration in relations.
Mr Blinken is expected to land in Beijing on Sunday and had planned to meet his opposite number Qin Gang as well as Wang Yi, China’s highest ranking diplomat.
A huge amount of painstaking diplomatic effort will have gone into making such a visit possible – the fact it was happening at all is a progress of sorts.
In recent days there has even been suggestions Mr Blinken might meet with President Xi Jinping himself.
If so, he would be the first US secretary of state granted this level of access in five years and it would be a major sign both sides are serious about attempting to smooth over their deeply damaged relations.
The Chinese leader and US President Joe Biden both recognised when they met at the G20 summit late last year that they need to do more to ensure that their distrust and competition does not descend into conflict and confrontation.
This visit was a clear part of that effort. But mutual recognition that spiralling tensions aren’t a good thing is not the same thing as the active rebuilding of trust.
This incident will likely be seen by the Americans as flying in the face of both. And there is, perhaps, an awareness here in Beijing of just how much jeopardy this incident poses to those fledgling efforts.
Indeed, at a regular news conference in Beijing on Friday, there was a clear desire on the Chinese part to contain speculation.
Foreign ministry spokesperson Mao Ning said China was “verifying” the situation and added: “I would like to emphasise that until the facts are clarified, speculation and hype will not be helpful to the proper resolution of the issue.”
Given the low ebb of current relations between the two, Mr Blinken’s visit was not expected to deliver any breakthroughs. It was being framed more as a chance for both sides to restate their positions and red lines and keep the channels of dialogue open.
It will likely never be known if this spy balloon was purposefully scheduled ahead of the visit or if it’s just unfortunate timing, but if it forces Mr Blinken to cancel, the ramifications for the longer term project of containing deteriorating relations could be very serious indeed.
Former US president Joe Biden has prostate cancer, his office has said.
The statement said Mr Biden, who left the White House in January, is reviewing options for treatment with his physicians.
It read: “Last week, President Joe Biden was seen for a new finding of a prostate nodule after experiencing increasing urinary symptoms.
“On Friday, he was diagnosed with prostate cancer, characterised by a Gleason score of 9 (Grade Group 5) with metastasis to the bone.
“While this represents a more aggressive form of the disease, the cancer appears to be hormone-sensitive which allows for effective management.
“The President and his family are reviewing treatment options with his physicians.”
Image: File pic: Reuters
According to Cancer Research UK, a Gleason score of 9 means the cancerous cells “look very abnormal” and the disease is “likely to grow quickly”.
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A source familiar with Mr Biden and his family’s thinking has told Sky’s US partner network, NBC News, that the former president is considering “multiple treatment options” – including hormone treatment for the cancer.
They added he is at his home in Wilmington, Delaware, and that as of now, it is unclear where the former president will be treated.
Mr Biden, 82, was the oldest person to ever serve as president, with concerns about his health raised regularly during his campaign for re-election last year.
A Mexican navy ship has hit the Brooklyn Bridge during a promotional tour in New York City.
The New York Fire Department said authorities were responding to injuries but had no details about how many people might have been hurt or whether they were on the vessel or on the bridge.
Sky’s US partner network NBC News reports that at least three people were seriously injured in the incident.
The Mexican navy said in a post on X that the Cuauhtemoc, an academy training vessel, was damaged in the accident, which has prevented it from continuing its voyage.
Eyewitness video of the collision posted online showed the mast of the ship, which was flying a large Mexican flag, scraping the underneath of the bridge.
Image: Pic: AP
The vessel then drifted toward the edge of the river as onlookers scrambled away from shore.
The Mexican navy said the status of personnel and material was under review by naval and local authorities, which were providing assistance.
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The Cuauhtemoc is about 297ft long and 40ft wide, according to the Mexican navy. It sailed for the first time in 1982.
Image: Pic: AP
Each year, it sets out at the end of classes at the naval military school to finish cadets’ training.
It left the Mexican port of Acapulco, on the Pacific coast, on 6 April with 277 people onboard, the navy said at the time.
This breaking news story is being updated and more details will be published shortly.
One person has died in a bomb explosion near a reproductive health clinic in California, authorities have said.
The incident took place in Palm Springs, a city two hours east of Los Angeles, and is being investigated as a possible car explosion.
The city’s mayor Ron DeHarte said one person died in the blast, adding that the bomb was “either in or near” a vehicle. The deceased’s identity is not known, Palm Springs police said.
Dr Maher Abdallah, who runs the American Reproductive Centers clinic, told the Associated Press his facility was damaged but all staff were safe and accounted for.
The explosion damaged the office space where the practice conducts patient consultations, but the IVF lab and stored embryos were unharmed, he added.
“I really have no clue what happened,” he said. “Thank God today happened to be a day that we have no patients.”
Image: Debris covers the ground after the explosion. Pic: ABC7 Los Angeles/AP
In a statement posted on Facebook the clinic said it was “heartbroken” to learn someone died in the explosion and added: “Our deepest condolences go out to the individuals and families affected.”
It continued: “Our mission has always been to help build families, and in times like these, we are reminded of just how fragile and precious life is.
“In the face of this tragedy, we remain committed to creating hope – because we believe that healing begins with community, compassion, and care.
The clinic will be fully operational on Monday, it added.
“This moment has shaken us – but it has not stopped us. We will continue to serve with strength, love, and the hope that brings new life into the world,” the statement concluded.
Image: Pic: ABC7 Los Angeles/AP
The Palm Springs city government said in a post on Facebook that the explosion happened on North Indian Canyon Drive, near East Tachevah Drive, before 11am local time (6pm GMT).
A burned-out car can be seen in a parking lot behind the building in aerial footage.
The blast caved in the clinic’s roof and blew debris across four lanes of the road.
Another person said he was inside a cannabis dispensary nearby when he felt a massive explosion.
Nima Tabrizi said: “The building just shook, and we go outside and there’s massive cloud smoke.”
Investigators from the FBI and the Bureau of Alcohol, Tobacco, Firearms and Explosives are travelling to the scene to help assess what happened.
California governor Gavin Newsom has been briefed on the explosion, his press office said.