- Balloon has been flying over United States for couple of days
- Pentagon advised Biden against shooting it down
- F-22s mobilized at Montana airport
- Canada reports "potential second incident"
- China 'verifying' situation, warns against speculation, hype
Fighter jets were mobilized, but military leaders advised President Joe Biden against shooting the balloon out of the sky for fear debris could pose a safety threat, advice Biden accepted, US officials said.
The United States took "custody" of the balloon when it entered US airspace and had observed it with piloted US military aircraft, one of the officials told reporters on condition of anonymity.
Separately, Canada's defense ministry said a "high-altitude surveillance balloon" was detected and that it was monitoring a "potential second incident", without giving further details, adding that it was in frequent contact with the United States.
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The news initially broke as CIA Director William Burns was speaking at an event at Washington’s Georgetown University, where he called China the "biggest geopolitical challenge" facing the United States.
"The United States government has detected and is tracking a high-altitude surveillance balloon that is over the continental United States right now," Pentagon spokesperson Brigadier General Patrick Ryder told reporters. "The balloon is currently traveling at an altitude well above commercial air traffic and does not present a military or physical threat to people on the ground."
Chinese foreign ministry spokesperson Mao Ning said Beijing was "verifying" the situation.
"I would like to emphasize that until the facts are clarified, speculation and hype will not be helpful to the proper resolution of the issue," she told a regular daily briefing in Beijing on Friday, adding that China abides by international law.
"China has no intention of violating the land territory and airspace of any sovereign country," Mao said.
US officials said they raised the matter with their Chinese counterparts through diplomatic channels. "We have communicated to them the seriousness with which we take this issue," a US official said.
One US official said the balloon was assessed to have "limited additive value from an intelligence collection perspective."
Blinken is expected to travel to China next week for a visit agreed to in November by Biden and Chinese President Xi Jinping. It was not clear how the discovery of the balloon might affect those plans.
US Senator Marco Rubio, the top Republican on the Senate intelligence committee, said the balloon was alarming but not surprising.
"The level of espionage aimed at our country by Beijing has grown dramatically more intense & brazen over the last 5 years," Rubio said on Twitter.
Republican Senator Tom Cotton called for Blinken to cancel his trip.
Republican House Speaker Kevin McCarthy said he would request a "Gang of Eight" briefing, referring to a classified national security briefing for congressional leaders and Republican and Democratic leaders of the intelligence committees.
Relations between China and the United States have soured in recent years, particularly following then-US House Speaker Nancy Pelosi's visit to Taiwan in August, which prompted dramatic Chinese military drills near the self-ruled island.
Since then, Washington and Beijing have sought to communicate more frequently and prevent ties from worsening.
US military leaders considered shooting down the balloon over Montana on Wednesday but eventually advised Biden against it because of the safety risk from debris, the official told reporters.
The Billings, Montana, airport issued a ground stop as the military mobilized assets including F-22 fighter jets in case Biden ordered that the balloon be shot down.
"We wanted to make sure we were coordinating with civil authorities to empty out the airspace around that potential area," the official said.
"But even with those protective measures taken, it was the judgment of our military commanders that we didn't drive the risk down low enough. So we didn't take the shot."
Defense expert John Parachini estimated the size of the balloon was equivalent to three bus lengths.
Billings resident Chase Doak, who filmed it on Wednesday, said at first he thought it was a star.
"But I thought that was kind of crazy because it was broad daylight and when I looked at it, it was just too big to be a star,” he told Reuters.
One of the officials said the flight path would carry the balloon over a number of sensitive sites, but did not give details. Malmstrom Air Force Base in Montana is home to 150 intercontinental ballistic missile silos.
A separate US official said the balloon had been tracked near the Aleutian Islands and Canada before entering the United States.
Such balloons typically operate at 80,000-120,000 feet (24,000-37,000m), well above where commercial air traffic flies.
