"We don't know who owns this object," said White House spokesperson John Kirby, adding that it was unclear where it began its flight.
President Joe Biden ordered the shootdown, which was announced from the White House.
Some lawmakers criticized the president for not shooting down the Chinese balloon sooner.
The object was shot down off the coast of northeastern Alaska over frozen U.S. territorial waters near the Canadian border.
UNMANNED VESSEL[1/4] White House National Security Council Strategic Communications Coordinator John Kirby takes questions during the daily press briefing at the White House in Washington, U.S. February 10, 2023.