People in a part of northwest Ohio now know why their windows shook Thursday morning from what they thought was an explosion.

Turns out it was a sonic boom.

The 180th Fighter Wing confirms that a pilot took an F-16 fighter jet out for a test flight after technicians finished some work on it at Toledo Express Airport. The test required the plane to be throttled up to supersonic speeds, resulting in a boom heard all over Seneca County southeast of Toledo.

Officials with the 180th say when conducting such tests, pilots try to keep the disruptions down by flying to areas not heavily populated.