Investigators:

Riverside County Sheriff’s investigators plan to recommend that an off-duty Costa Mesa police officer who shot and killed one man and wounded another in Temecula last month not be charged because he was acting in self-defense, authorities said Monday.

Officer Scott Dibble, 31, a nine-year veteran of the force, shot the men during a fracas March 8 in Temecula after a group of men they were a part of attacked him from behind and beat him to the ground, police said. Witnesses told police Dibble showed his badge and identified himself while he was being attacked, sheriff’s investigator Jerry Franchville said.

Sheriff’s investigators have not yet sent their report to prosecutors. They are continuing to investigate whether anyone else involved in the shooting should be charged, Franchville said.

— Joseph Serna