Police are investigating an armed robbery that happened Sunday morning at a North Main Street gas station.

The robbery happened at 8:24 a.m. at Murphy USA in the 1200 block of North Main Street, a city press release stated.

Preliminary investigation found that a black male dressed in dark clothing, a ball cap and sunglasses displayed a firearm and demanded money, the press release stated. He fled on foot with an undetermined amount of currency.

There were no injuries, and the investigation remains ongoing.

Anyone with information is asked to contact Crime Line at 1-888-LOCK-U-UP. Tipsters can also submit tips by going to www.p3tips.com or by visiting the Suffolk Police Department website at www.suffolkva.us/spd and looking for the Suffolk Crime Line link. Tipsters never have to give their names or appear in court and may be eligible for a reward of up to $1,000.