In the most recent incident since a suspected Chinese surveillance balloon placed North American security forces on high alert, US military fighter planes shot down an octagonal object above Lake Huron on Sunday, according to the Pentagon.
It was the fourth flying object that a US missile had shot down over North America in a little over a week.
General Glen VanHerck of the US Air Force, who is in charge of defending US airspace, told reporters that the military has not been able to determine the nature of the three most recent objects, how they maintain their altitude, or their origin.
The commander of NORAD and Northern Command, VanHerck, explained: "We're calling them objects, not balloons, for a reason.
VanHerck stated that he wouldn't exclude any possible explanation, including aliens. I'll leave it up to the intelligence and counterintelligence communities, he added.
Subsequently, a different defence officer who requested anonymity claimed that the military had not found any proof that the objects were extraterrestrial.
As directed by President Joe Biden, a US F-16 fighter downed the item at 2:42 p.m. local time over Lake Huron near the US-Canada border, according to a statement released by the Pentagon's Brigadier General Patrick Ryder.
Ryder said the item, which was flying at 20,000 feet (6,100 metres) and did not constitute a military danger, may have potentially interfered with domestic aviation traffic and might have had monitoring capabilities.
An anonymous US official described the item as having an octagonal shape, strings dangling off of it, and no obvious cargo.
According to the Pentagon, the object was thought to be the same as one that was recently discovered above Montana close to important military locations, which forced the closing of US airspace. According to VanHerck, the military will make an effort to find the item that crashed over Lake Huron in order to learn more about it.
It probably dropped into Canadian seas, he added. The event increased tensions with China and highlighted concerns about the current rash of strange objects that have been spotted over North American skies.

