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U.S. military fighter jets on Sunday shot down an octagonal object over Lake Huron, the Pentagon said, the latest incident since a suspected Chinese surveillance balloon put North American security forces on high alert.

It was the fourth flying object to be shot down over North America by a U.S. missile in a little more than a week. China's foreign ministry said it had no information on the latest three flying objects shot down by the United States.

U.S. Air Force General Glen VanHerck, who is tasked with safeguarding U.S. airspace, told reporters that the military has not been able to identify what the three most recent objects are, how they stay aloft, or where they are coming from.