The US military is unsure what the three flying objects it shot out of the skies were.
US Fighter Jets have been shooting down flying objects
President Joe Biden ordered another object to be shot down on Sunday (12.02.23), the fourth item in total to be downed this month.
The latest object - which was shot down over Lake Huron in Michigan near the Canadian border - has been described by defence officials as an unmanned "octagonal structure" that had strings attached to it.
A military commander said that it could be a "gaseous type of balloon" or "some type of propulsion system" and refused to rule out the prospect of extraterrestrials.
US Northern Command General Glen VanHerck said that there is no indication of any threat to the US after a spate of incidents this month.
He said: "I'm not going to categorise them as balloons. We're calling them objects for a reason.
"What we are seeing is very, very small objects that produce a very, very low radar cross-section."
Pressed on whether the objects could be aliens, General VanHerck said: "I will let the intel community and the counterintelligence community figure that out.
"I haven't ruled anything out at this point."
A suspected Chinese spy balloon was shot down off the coast of South Carolina earlier this month after hovering for several days over the United States. The incident has increased tensions between Washington and Beijing, who claimed that it was a weather monitoring device that had blown astray.
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