An F-16 fighter jet on a routine training mission crashed in Michigan's Upper Peninsula Tuesday night, the Wisconsin National Guard said.
There was no word on the fate of the pilot, who was the only person on board.
"The search for the pilot continues and the pilot's status remains unknown at this time," the Wisconsin National Guard's 115th Fighter Wing said in a statement.
The 115th Fighter Wing was coordinating with the U.S. Coast Guard and other government agencies overnight.
"Search and rescue efforts on the ground, in the air, and in the water continue," it said.
The "Fighting Falcon" was from the 115th Fighter Wing at Truax Field Air National Guard Base in Madison.