The United States has not yet been able to identify recently downed objects found in North American airspace, White House national security spokesman John Kirby said on Monday.
Kirby told a White House press briefing that closer scrutiny of airspace may partially explain the increase in objects detected but that they were not assessed as a threat to people on the ground and showed no signs they had maneuvering or propulsion capability.
U.S. military fighter jets on Sunday shot down an octagonal object over Lake Huron, the Pentagon said, the latest incident since a suspected Chinese surveillance balloon put North American security forces on high alert.
Kirby added that the United States was not flying balloons over China and that he was not aware of any other U.S. craft flying into Chinese airspace.
