The U.S. military started tracking more airborne objects it calls "low speed clutter" after shooting down the Chinese balloon. The National Weather Service says it launches about 184 balloons a day.
The U.S. and China have traded fiery allegations of extensive aerial surveillance programs since the U.S. shot down a Chinese balloon on Feb. 4. Here's a look at what's happened so far.
"Crews have been able to recover significant debris from the site, including all of the priority sensor and electronics pieces identified," U.S. Northern Command said.
A unidentified object has been shot down by U.S. forces over Michigan's Lake Huron, according to the Pentagon. It's the fourth aerial shootdown in just over a week in North America.
Canadian Prime Minister Justin Trudeau and President Biden ordered the takedown "out of an abundance of caution" after the object violated Canada's airspace, the White House said.
The incident comes just days after the U.S. shot down a Chinese spy balloon off the coast of South Carolina. This new object was smaller and lower, and it's not clear where it came from.
Senator Michael Bennet has joined calls from several other lawmakers to ban TikTok from Apple and Google app stores. NPR's Michel Martin asks him what makes the app a national security risk.
Chinese surveillance balloons have flown over the U.S. at least four times in recent years. But the U.S. didn't learn about these cases until the intelligence community discovered them afterwards.
China on Monday accused the United States of indiscriminate use of force when the American military shot down a suspected Chinese spy balloon over the weekend.