Officials described the balloon as being roughly 60m (200ft) tall and most likely weighing 71st (1,000lbs).
Authorities had waited until the balloon went over the Atlantic to shoot it down given its size and weight and the associated risk to people and property.
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Moment ‘spy balloon’ is shot down
The Chinese foreign ministry called the balloon shooting an “obvious overreaction” that “seriously violated international conventions”, in a statement on Sunday.
The appearance of the balloon over the US sparked a diplomatic crisis between Washington and Bejiing, with US secretary of state Antony Blinken cancelling his visit to the world’s second-largest economy as a result.
The much-anticipated visit was to be the first of its kind since 2018.