The US is tracking what it termed a Chinese spy balloon, which has been hovering over Montana.
On Friday, China confirmed the balloon belonged to it but said it was not being used for spying.
In an official statement, China's foreign ministry said the balloon is a civilian airship used mainly for "meteorological research."
"Clearly, the intent of the balloon is first surveillance, and so the current flight path does carry it over a number of sensitive sites," the official said.
This has alarmed some officials, including Montana Senator Steve Daines, who said the fact the balloon was occupying Montana airspace "creates significant concern."