The US military is ‘still unsure’ what the flying objects it shot out of the skies over North America were – and how they were able to stay aloft.
President Joe Biden ordered another object – the fourth in total this month – to be downed on Sunday.
As it was traveling at 20,000ft (6,100m), it could have interfered with commercial air traffic, the US said.
A military commander said it could be a "gaseous type of balloon" or "some type of a propulsion system". He added he could not rule out that the objects were extra-terrestrials.
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