HOUSTON – Police are asking for help in identifying four people wanted in a robbery that happened at a gas station in April.

It happened just before 2:30 a.m. April 30 at the Shell gas station at 4904 Airline Drive in Houston.

Police said three armed people entered the gas station as a fourth person held the door open and served as a look-out. The other three people demanded money.

One of the robbers pointed his weapon at an employee and fired a shot, police said. The round struck the employee's pant leg, but he was not hurt.

The robbers then fled the scene on foot.

Anyone with information is asked to call the Houston Police Department's Robbery Division at 713-308-0700 or Crime Stoppers at 713-222-TIPS.