The White House has defended the shootdowns of three unidentified objects in as many days even as it acknowledged that officials had no indication the objects were intended for surveillance in the same manner as the high-altitude Chinese balloon that traversed American airspace earlier this month.
The three objects, including one shot down on Sunday over Lake Huron, were travelling at such a low altitude as to pose a risk to civilian air traffic, said White House national security spokesman John Kirby.
While the Biden administration does not yet have evidence that they were equipped for spying purposes — or even belonged to China — officials have not ruled that out, he said.
“These were decisions based purely and simply on what was in the best interests of the American people,” Mr Kirby said.
The weeks-long succession of objects, starting with a giant white orb first detected over US skies in late January, has puzzled American officials and stirred curiosity around the world.
“Because we have not been able to definitively assess what these most recent objects are, we acted out of an abundance of caution,” Mr Kirby said.
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One possibility that the US has been able to rule out is any connection to extraterrestrial activity, the White House said on Monday, tamping down lighthearted public speculation about aliens and outer space.
“There is no — again, no — indication of aliens or extraterrestrial activity with these recent takedowns,” White House press secretary Karine Jean-Pierre said at the outset of a press briefing.
Other Western nations are also trying to assess the spate of incidents.
British Prime Minister Rishi Sunak said on Monday that the government would do “whatever it takes” to protect the country, as the UK announced a security review.
Canadian Prime Minister Justin Trudeau said “there is some sort of pattern” to the balloon and three other objects, though the US has not echoed that claim.
Mr Kirby spoke from the White House podium hours after China alleged that more than 10 US high-altitude balloons have flown in its airspace during the past year without its permission.
American officials have vigorously denied the claim, with Mr Kirby saying on Monday, “We are not flying surveillance balloons over China.”
The Chinese allegation came after the US shot down a suspected Chinese spy balloon that had crossed from above Alaska to South Carolina over a period of multiple days, sparking a new crisis in bilateral relations that have sunk to their lowest level in decades and prompted US Secretary of State Antony Blinken to cancel a planned visit to China.
The latest of the three objects was shot down on Sunday over Lake Huron after being detected a day earlier over Montana.
On Friday, the North American Aerospace Defence Command, the combined US-Canada organisation known as Norad that provides shared defence of airspace over the two nations, detected and shot down an object near sparsely populated Deadhorse, Alaska.
Later that evening, Norad detected a second object flying at a high altitude over Alaska, US officials said. It crossed into Canadian airspace on Saturday and was over the Yukon, a remote territory, when it was ordered shot down by Mr Trudeau.
In both of those incidents, the objects were flying at roughly 40,000 feet. The object on Sunday was flying at about 20,000 feet.
None of the three most recent objects has been recovered, US Defence Secretary Lloyd Austin told reporters in Brussels, where he was scheduled to attend a meeting of Nato defence ministers this week.
Mr Austin said weather has impeded recovery efforts in Alaska, while in Canada the object was shot down in a very remote area that was also impeding efforts.
In Alaska, where the object landed on sea ice, wind chill and safety concerns “are dictating recovery timelines”, he said.