Authorities say two off-duty Los Angeles police officers have been arrested after a man was pistol-whipped during a confrontation.

Whittier police say 29-year-old Brandon Valdez and 38-year-old Patrick Fitzgerald were booked on suspicion of assault with a deadly weapon Tuesday night after the off-duty incident.

They were released Wednesday on $30,000 bail each. The LAPD says they are on administrative leave pending an investigation.

Whittier Lt. Carlos Solorza says the officers had been drinking and were outside a cafe when one began arguing with his girlfriend.

Whittier Officer Mike Dekowski says Valdez then turned on a bystander, punched him in the face and pistol-whipped him.

Dekowski says the 31-year-old man was treated for serious head injuries at a hospital. There's no word on his condition.