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Chinese spy balloon - US tracks suspected surveillance device
The US is tracking a suspected Chinese surveillance balloon that has been spotted flying over sensitive sites in recent days.
Defence officials said they were confident the "high-altitude surveillance balloon" belonged to China. It was most recently seen above the western state of Montana.
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The military decided against shooting it down in case debris falls.
China warned against speculation and "hype" until the facts are verified.
The object flew over Alaska's Aleutian Islands and through Canada before appearing over the city of Billings in Montana on Wednesday, US officials said.
A senior defence official said the government prepared fighter jets, including F-22s, in case the White House ordered the object to be shot down.
Montana, a sparsely populated state, is home to one of only three nuclear missile silo fields in the country, at Malmstrom Air Force Base, and the official said the apparent spy craft was flying over sensitive sites to collect information.
But the military leaders advised against taking "kinetic action" against the balloon because of the danger that falling debris might pose to people on the ground.
Officials refrained from giving information about the exact size of the balloon, but described it as "sizeable", with reports of pilots being able to see it, even from a distance.
US media have reported another US official comparing it to the size of three buses.
The defence department, however, said there was no "significantly enhanced threat" of US intelligence being compromised, because American officials "know exactly where this balloon is and exactly where it's passing over".
And there was also no threat to civilian aviation as the balloon was "significantly" above the altitude used by commercial airlines.
The statement added that the balloon is unlikely to give much more information than China can already collect using satellites.
The US had raised the matter with Chinese officials in their embassy in Washington DC and in Beijing, officials added.
China's foreign ministry spokesperson Mao Ning said Beijing is currently attempting to verify the reports of the surveillance balloon, adding that "until the facts are clear, making conjectures and hyping up the issue will not help to properly resolve it".
"China is a responsible country and always abides strictly by international law.
We have no intention of violating the territory or airspace of any sovereign country," she said.
During Thursday's briefing at the Pentagon, officials declined to disclose the aircraft's current location and did not give information on where it was launched from.
They added that such surveillance balloons had been tracked in the past several years, but this one was "appearing to hang out for a longer period of time this time around".
It confused social media users in Montana, with some posting images of a pale round object high in the sky.
Others reported seeing US military planes in the area, apparently monitoring the object.
Billings office worker Chase Doak told the Associated Press news agency that he noticed the "big white circle in the sky" and went home to get a better camera.
"I thought maybe it was a legitimate UFO," he said.
"So I wanted to make sure I documented it and took as many photos as I could."
Chinese state media site the Global Times accused the US of aggravating tensions between China and the US by frequently creating a Cold War atmosphere.
It is also being widely discussed on Chinese social media, with many amused at the reported use of balloons for surveillance.
"We have so many satellites, why would we need to use a balloon," wrote one user on Weibo.
Senator Marco Rubio, the top Republican on the Senate Intelligence Committee, slammed China's alleged balloon.
"The level of espionage aimed at our country by Beijing has grown dramatically more intense & brazen over the last 5 years," he tweeted.
Montana Governor Greg Gianforte, a Republican, said in a statement that he had been briefed on the "deeply troubling" situation.
Speaking at an unrelated event in Washington DC on Thursday, CIA Director William Burns made no mention of the balloon, but called China the "biggest geopolitical challenge" currently facing the US.
The alleged spy craft is likely to increase tensions ahead of US Secretary of State Antony Blinken's visit to China next week.
It will be the first visit to the country by a Biden administration cabinet secretary.
The top US diplomat will be in Beijing to hold talks on a wide range of issues, including security, Taiwan and Covid-19.
He will also meet Chinese President Xi Jinping, the Financial Times reported on Thursday.
Balloons are one of oldest forms of surveillance technology.
Compared to other air surveillance devices, they can be operated cheaply without personnel, while remaining airborne for long periods of time.