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.
The Europeans broke the Ryder Cup duck. Never expecting to shake off the bizarre distraction of a squeaky duck toy.
Never imagining the Americans would make them fight so hard on the final day in New York.
What had been shaping up to be a record-breaking win instead turned into a desperate scrap to avoid throwing it all away.
So ultimately, everything the American crowd did to antagonise the visitors backfired.
A raucous crowd is the Ryder Cup‘s appeal. Why no away team has won the biennial since 2012 – until now.
But the bitterness and toxicity were off the scale at Bethpage Black. Europe overcame it to win the 45th edition of golf’s most prestigious team prize.
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2:26
Team Europe win Ryder Cup
After the putt that retained the trophy and a roar of relief, Ireland’s Shane Lowry said: “I’ve been so lucky to experience amazing things in this game.
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“That was the hardest couple of hours of my life.”
It was tighter, tenser, and far more stressful than anyone imagined after Europe began Sunday’s singles session with a 12-5 lead.
Humiliation was avoided for the Americans after Donald Trump became their first sitting president to attend the Ryder Cup on Friday.
POTUS saw Europe start to build a commanding lead.
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0:47
President Trump arrives at Ryder Cup
Maybe that’s why the home crowd was so riled and rattled by Saturday. It wasn’t just rowdy. This became the most abusive Ryder Cup in almost a century of matches.
There is firing up the home crowd and what unfolded at the first tee – a course announcer hurling a vulgarity at Rory McIlroy.
The tone was set for spectators goading the Northern Irishman with abuse about his private life and performances.
It was an understatement when he later described conditions as “really challenging”.
So by the time Day 3 began, and the foul-mouthed announcer had apologised and stepped down, maybe it was no coincidence Aretha Franklin’s “Respect” was the morning soundtrack in the grandstand.
But there was a new tactic to disturb and antagonise – the ducks given out with cherry fairway fizz drinks.
Repeatedly squeaked as Europeans took their shots, McIlroy finally complained.
But eventually, as the hosts fought back, reeling off wins in the singles to put more red on the board, Europe made it over the line, scraping over the line with a salvage job.
“It’s been one of the hardest days I’ve ever experienced on a golf course,” said Tyrrell Hatton after drawing the penultimate match to secure the win.
“Those last five, six, seven holes were horrible.”
Instead of a record victory margin, 15-13 was the tightest since Europe won by a point at Medinah, Illinois, in 2012.
The weekend produced more drama, more discord, and disturbances in New York than imagined by Luke Donald, the first captain since fellow Englishman Tony Jacklin to win back-to-back editions since the 1980s.
“It’s got to be the most stressful 12 hours of my life,” he said. “We knew they’d be tough, we didn’t think they’d be this tough.”
A person has been killed and several others injured after a mass shooting and fire at a Mormon church in Michigan, police have said.
Authorities said at a news conference that the suspect was shot dead by police officers, and that nine others were injured.
Two of those were said to be in critical condition, Grand Blanc Township Chief William Renye told reporters.
Image: Flames and smoke rising from the Church of Jesus Christ of Latter-day Saints in Grand Blanc. Pic: Julie J, @Malkowski6April / AP
He added that the suspect was a 40-year-old man from Burton, who drove his vehicle into the church and began firing rounds at the hundreds of people attending Sunday service.
The suspect used an assault rifle and deliberately started the blaze, Chief Renye said, before adding that officers believe they will find additional victims in the fire.
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Image: Pics: AP
The incident took place at around 11am local time at the Church of Jesus Christ of Latter-day Saints in Grand Blanc, about 50 miles north of Detroit.
In a statement on Sunday morning, Grand Blanc Township Police Department added that the church was “actively on fire” and urged the public to avoid the area.
Michigan governor Gretchen Whitmer said in a statement that “my heart is breaking for the Grand Blanc community” after the shooting.
She added: “Violence anywhere, especially in a place of worship, is unacceptable. I am grateful to the first responders who took action quickly.”
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Genesee County sheriff Christopher Swanson said at around 12.20pm (5.20pm in the UK) that the “entire church is on fire”, and confirmed that people who were at the church have been evacuated.
Around 20 minutes later, the police department said the fire had been contained.
Image: The incident took place at the Church of Jesus Christ of Latter-day Saints in Grand Blanc
US attorney general Pam Bondi also confirmed the FBI and the Bureau of Alcohol, Tobacco, Firearms and Explosives are responding to the incident.
US President Donald Trump said on Truth Social that “the suspect is dead, but there is still a lot to learn”, before saying the shooting “appears to be yet another targeted attack on Christians in the United States of America”.
He added: “PRAY for the victims, and their families. THIS EPIDEMIC OF VIOLENCE IN OUR COUNTRY MUST END, IMMEDIATELY!”
In the wake of the shooting and fire, the New York Police Department said it would deploy officers to religious institutions across the city “out of an abundance of caution”.
The incident occurred the morning after Russell M Nelson, the oldest-ever president of The Church of Jesus Christ of Latter-day Saints, died at 101.
Shootings reported in North Carolina, New Orleans, Texas
Meanwhile, authorities responded to a mass shooting at a coastal town in North Carolina late on Saturday, where three people were killed.
At least eight others were injured in that incident, where someone opened fire from a boat into a crowd at a bar.
Another shooting took place at a south Texas casino early on Sunday, with seven people shot and two killed.
A woman was also killed, and three others were injured in Bourbon Street, New Orleans, early on Sunday after a shooting.
It was one sentence among the many words Donald Trump spoke this week that caught my attention.
Midway through a jaw-dropping news conference where he sensationally claimed to have “found an answer on autism”, he said: “Bobby (Kennedy) wants to be very careful with what he says, but I’m not so careful with what I say.”
The US president has gone from pushing the envelope to completely unfiltered.
Last Sunday, moments after Charlie Kirk‘s widow Erika had publicly forgiven her husband’s killer, Mr Trump told the congregation at his memorial service that he “hates his opponents”.
Image: President Donald Trump embraces Charlie Kirk’s widow Erika. Pic: AP
The president treats professional disapproval not as a liability but as evidence of authenticity, fuelling the aura that he is a challenger of conventions.
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“I’m really good at this stuff. Your countries are going to hell,” he told his audience, deriding Europe’s approach to immigration as a “failed experiment of open borders”.
Image: Mr Trump addresses the UN General Assembly in New York. Pic: Reuters
Then came a U-turn on Ukraine, suggesting the country could win back all the land it has lost to Russia.
Most politicians would be punished for inconsistency, but Mr Trump recasts this as strategic genius – framing himself as dictating the terms.
It is hard to keep track when his expressed hopes for peace in Ukraine and Gaza are peppered with social media posts condemning the return of Jimmy Kimmel to late-night television.
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2:29
Trump’s major shift in Ukraine policy
Perhaps most striking of all is his reaction to the indictment of James Comey, the FBI director he fired during his first term.
In theory, this should raise questions about the president’s past conflicts with law enforcement, but he frames it as vindication, proof that his enemies fall while he survives.
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0:49
Ex-FBI chief: ‘Costs to standing up to Trump’
Mr Trump has spent much of his political career cultivating an image of a man above the normal consequences of politics, law or diplomacy, but he appears to feel more invincible than ever.