DURHAM, N.C. (WNCN) – A man pretending to be a law enforcement officer pulled a woman over Tuesday and robbed her of her purse at gunpoint, Durham County sheriff’s deputies said.

Deputies are urging people to be on the lookout for the robber, who displayed a single blue light on the dark-colored SUV he was driving.

The man used the light to pull the woman over at about 10:30 p.m. on Big Horn Road near Guess Road, then approached the woman’s vehicle brandishing what looked like a rifle, according to deputies.

He took her purse and fled, leaving her unharmed, deputies said.

Deputies launched an “exhaustive” search, but were unable to find the man, who remains at large.

The sheriff’s office said drivers being pulled over by unmarked vehicles can call 911 to verify the vehicle behind them contains a legitimate law enforcement officer.

Durham police recently reported that someone had stolen a number of police uniforms. The robber in this case was described by the victim as wearing dark-colored clothing and a beanie hat, deputies said. He was also wearing a mask.

Anyone with information about the incident is asked to call the sheriff’s office at 560-0900 or CrimeStoppers at (919) 683-1200. Tips can also be sent to crimetip@durhamsheriff.org.