DETROIT (AP) — Police have stopped a number of cars that appear to be involved in “suspicious activities” along some southeast Michigan roads and freeways in an effort to find a man shooting randomly at passing vehicles.

Officers are looking for anything out of the norm as part of a four-county investigation into two dozen vehicle shootings, said Lt. Mike Shaw, of the state police post in Brighton. Shootings have been reported in Oakland, Livingston, Ingham and Shiawassee counties.