The unidentified object, which was about the size of a car and didn’t have the ability to maneuver, “posed a reasonable threat to the safety of civilian flight,” the White House said. The nature of the craft was unknown though National Security Council spokesman John Kirby said it was far smaller than the Chinese balloon downed off the coast of South Carolina last Saturday.

The Pentagon has deployed planes and helicopters to recover the object, which fell onto ice.

The object was downed off northeastern Alaska, near the border with Canada, in Arctic Ocean waters after being identified overnight. The president was then briefed. F-22 fighter jets flew by to observe it Thursday night and again Friday before it was shot down with a Sidewinder missile — the same type used to bring down the balloon off South Carolina.

US officials said there had been no outreach to China about the latest object. There is nothing yet to indicate what it was or where it came from, and no evidence it came from China.

Its presence will, however, raise questions of whether there is any link to the Chinese balloon that was identified early last week and which the US argues was part of military-led espionage program in some 40 countries. US crews are working to recover the wreckage of that balloon.

In a separate briefing, Pentagon spokesman Brigadier General Pat Ryder said the search crews had located a significant amount of debris from the Chinese balloon, though he said bad weather was keeping them from bringing most of it up from the ocean floor.

He said there was no indication that the two episodes were connected while acknowledging the apparent similarities.

“I think we are all, to include the media and the public, very attuned to balloons at the moment,” Ryder said.

The latest drama will only prolong the balloon episode, which has gripped US and global attention since last Wednesday when residents in Montana spotted a white object high above in the sky. The US has since argued that the Chinese balloon was sent deliberately by China to surveil the US and was a violation of US airspace.

Chinese officials have insisted the balloon that was shot down last week was a weather-monitoring device that blew off course. Foreign Ministry spokeswoman Mao Ning said Friday that the balloon was a civilian craft and its transit across the US last week was an “isolated, unexpected incident.” 

Biden has said the alleged espionage incident didn’t seriously hurt US-China relations, even though it forced Secretary of State Antony Blinken to cancel a planned trip and led to an increasingly heated series of accusations from both sides. Biden has also come under fire from Republican lawmakers who said the balloon should have never been allowed to traverse the continental US for a week before it was shot down.

As the US measures its response, the Biden administration named six Chinese companies to an export blacklist over what it argues are links to the military-backed espionage program. The companies had links to military programs “including airships and balloons and related materials and components,” the department said. 

It said the Chinese military is using high-altitude balloons “for intelligence and reconnaissance activities” that go against US national-security interests.

ABC News reported Friday that the balloon’s main undercarriage has been located underwater and is largely intact. The report, which cited US officials who weren’t identified, said the equipment had yet to be retrieved.

The Federal Bureau of Investigation released photographs that showed agents examining the balloon’s white canopy and helping direct vessels across the water in search of new material. On a call Thursday, FBI officials told reporters the bureau had yet to access the balloon’s main payload.

In a series of briefings and hearings with lawmakers on Thursday, US officials argued there was no doubt that the balloon was a surveillance device used under a program run by China’s People’s Liberation Army. They said it was carrying equipment with sensors designed to pick up communications signals and pointed to the fact that it had hovered over sensitive US military sites during its transit across the US.

The Biden administration said the manufacturer of the device, which it didn’t name, had a direct relationship with the People’s Liberation Army. 

Attention was also shifting to how China sourced the parts that went into the balloon’s payload, as lawmakers questioned whether President Joe Biden ought to have done more to limit the export of sensitive technology to China. People familiar with the matter said lawmakers were told Thursday that the balloon had western-made components with English-language writing on them.

China’s chargé d’affaires in Washington, Xu Xueyuan, told a virtual conference hosted by the U.S.-China Business Council on Wednesday that the two nations “shouldn’t let this incident offset efforts made to stabilize ties.”