The BBC reports that President Joe Biden ordered another object drop – the fourth in total this month – on Sunday.
The US said that because it was traveling at an altitude of 20,000 feet (6,100 metres), it could interfere with commercial air traffic.
It could be an “invasive kind of balloon” or “some kind of propulsion system,” said a military commander.
He added that he could not rule out that the objects were extraterrestrials, the BBC reported.
The BBC reported that the latest object – shot down near the Canadian border – was described by defense officials as an unmanned “octagonal structure” with strings attached to it.
It was shot down by a missile fired from an F-16 fighter jet at 14:42 local time.
The incident raises more questions about the wave of high-altitude objects shot down over North America this month.
The BBC reported that the commander of US Northern Command, General Glenn Vanherk, said there were no indications of any threat.
“I wouldn’t classify them as balloons. We call them things for a reason,” he said.
“What we’re seeing are very, very small things that produce a very, very low radar cross-section,” he added, according to the BBC.
Speculation about what could be intense has intensified in recent days.
“I’ll let the intelligence community and the counter-intelligence community figure it out,” the BBC reported, when asked if the creatures could be aliens or extraterrestrials.
“I haven’t ruled anything out at this point.”
A suspected Chinese spy balloon was shot down off the coast of South Carolina on February 4 after it had flown for several days over the United States. Officials said it originated in China and was used to monitor sensitive websites.
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