The U.S. shot down a fourth flying object over North America Sunday, this one over Lake Huron in Michigan.

Montana airspace was closed near Havre Saturday night for what the FAA determined was a “radar anomaly,” according to the Pentagon.

The Pentagon used an F-16 fighter jet to shoot down what is dubbed an “unidentified object” with a Sidewinder air-to-air missile.

This object was unidentified, as was an object shot down over the Yukon Territory in Canada on Saturday and another shot down over the Arctic Ocean near Alaska on Friday.