A Saco police cruiser collided with another vehicle Saturday evening while the officer was responding to a suspected aggravated assault on Flag Pond Road near the Maine Turnpike overpass, police said. The call about the assault came at 6:23 p.m., when someone reported that two or three men were beating a third man with a baseball bat, and that the people responsible then fled in a vehicle on Flag Pond Road. The victim who was allegedly beaten by the other men was treated and released for moderate injuries at Maine Medical Center. Early Sunday morning, a 16-year-old was arrested and is facing one count of aggravated assault, said Saco Deputy Chief Jack Clements.