SCARBOROUGH — A Maine State Police trooper has been injured after his cruiser was hit on the Maine Turnpike. The crash happened at around 4:30 p.m. Thursday in Scarborough. Police say Trooper Ryan Keller was in the median in the northbound side of the highway helping a driver who was stuck. The driver of a truck failed to notice the slowing traffic, swerved to avoid the stopped cars and hit the back of Keller’s cruiser. Keller suffered a cut on his head.