The US believes the balloon was monitoring sensitive military sites.
Its discovery set off a diplomatic crisis, with US Secretary of State Antony Blinken immediately calling off this weekend's trip to China.
The Chinese authorities denied it was used for spying and insisted it was a weather ship blown astray.
High-altitude spying marks new low for US-China ties
Was China balloon blown off course?. บาคาร่า88
Why use a spy balloon instead of satellites?