The Michigan State Police says four cars were hit by "projectiles" along I-75 in metro Detroit Sunday afternoon, and they don't think it was an accident.
Drivers told police that something struck the rear windows of their cars while driving along a 10-mile stretch between Troy and Detroit. Police say some windows were shattered, but no one was injured.
Flying road debris has been a problem on some highways this winter, but police have ruled that out. They also don't believe the damage was caused by a gun, but say someone could have used a BB gun or a slingshot.
All of the incidents are believed to be connected, and police are asking anyone else who was hit to contact them.