Police say a northern Virginia man was impersonating an officer when he pulled over a car being driven by a real cop.

Prince William County Police say 27-year-old Shawn Michael Robinson of Alexandria pulled over an off-duty officer last Thursday.

Police say Robinson was driving a white Crown Victoria close behind the off-duty officer's car around 1 a.m. Thursday. Police say the real officer pulled over when Robinson turned on a spotlight attached to his car.

Instead of getting out, police say Robinson pulled alongside the officer's car. Police say Robinson sped off when the officer identified himself.

Police later issued a warrant for his arrest and Robinson turned himself in. He's being held without bond on a charge of impersonating an officer.

It's unclear whether Robinson has an attorney.