Derby ? Police in a Wichita suburb are looking for a man driving a gray Ford Crown Victoria that resembles a patrol car and using flashing lights in the grill to stop other vehicles.

Derby police tell KWCH-TV the man wears a silver badge and a name tag and has been impersonating an officer.

A Derby resident says the man pulled him over Wednesday, but left in a hurry after being asked for his badge number.

Police say drivers need to be careful when they’re being pulled over by someone driving an unmarked car. They say Derby has some unmarked vehicles, but those have flashing lights in the window, not in the grill.