AURORA, Colo. (CBS4) – Police in Aurora say they have arrested a man accused of impersonating a police officer and say they caught him in the act with the help of a citizen.

According to Sgt. Chris Amsler, a woman driving near East Montview Boulevard and North Dallas Street at approximately 1:15 a.m. Monday contacted police saying she believed a police impersonator was attempting to pull her over.

“The female described to the 911 dispatcher the vehicle was an older model Subaru Legacy using a white strobe light mounted inside the vehicle in the center of the windshield in front of the rear view mirror,” Amsler said in a statement.

The Subaru also had amber lights in the rear window. The woman reported that the man was the only person in the suspect vehicle.

“The female driver remained on the phone for several minutes while the vehicle continued to follow her,” Amsler said.

Officers were able to quickly locate the suspect vehicle and were able to pull the suspect and the victim over.

“The suspect was armed and was wearing a gray security uniform with no identifiable police badges or insignia,” Amsler said.

The suspect, identified as Antonio Marcus Arbogast, 22, was arrested and his vehicle was impounded. He faces charges of impersonating a peace officer, harassment and reckless driving.

One Arbogast’s roommates, who didn’t want to be identified, said his arrest isn’t a surprise.

“I’ve ridden in the car with him multiple times when he shined his strobe light at them trying to pull them over,” said the roommate.

He also told CBS4 that Arbogast wanted to be a cop but was denied and that his fascination with law enforcement may have led him to extreme measures.

“He likes to make sure that the world is safe and I think that he might have started getting a little overboard with it,” said the roommate.

While his roommate thinks his intentions were harmless, the police aren’t so sure. What Arbogast is accused of is a crime.

Arbogast’s roommate told CBS4 he was working as a security guard but wouldn’t confirm what company.