Here is what we know about the unidentified objects shot down over North America

A high-altitude object was shot down near Lake Huron on Sunday afternoon, marking the fourth time in just over a week that the US military has taken down objects in North American airspace.

On Saturday, an unidentified object was downed over northern Canada, a day after another object had been shot down over Alaska airspace by a US F-22. Last weekend, a Chinese surveillance balloon was taken down by F-22s off the coast of South Carolina.

There’s no indication at this point that the unidentified objects have any connection to China’s surveillance balloon, but it seems that national security officials across the continent remain on edge.

Democratic Rep. Elissa Slotkin of Michigan said Sunday that the operation to down the object near Lake Huron was carried out by pilots from the US Air Force and the National Guard.

CNN initially reported that the object was shot down over Lake Huron based on what sources said to CNN and a public tweet by Republican Rep. Jack Bergman of Michigan.