OAKLAND — A gun being used by a robber to pistol whip a man outside the MacArthur BART Station Friday morning went off but no one was injured by the bullet, authorities said.

The robbery happened about 8:40 a.m. in the 500 block of 40th Street outside the station, police said.

Authorities said preliminary information indicates the suspect apparently pistol-whipped the victim, causing injuries to the victim’s face. During the incident, the suspect’s gun went off but nobody was hit with the shot.

The robber and another person were last seen driving away from the station toward Telegraph Avenue. Authorities did not say what if anything was taken from the victim.

The victim was taken to a hospital for treatment of his injuries.

Police were interviewing witnesses and reviewing surveillance video from the station to try and identify the suspects.

The incident did not impact BART service, officials said.

Police and Crime Stoppers of Oakland are offering up to $5,000 in reward money for information leading to the arrest of the suspects. Anyone with information may call police at 510-238-3326 or Crime Stoppers at 510-777-8572.

Check back for updates.