LOS ANGELES (AP) Authorities were continuing to search Monday for a gunman who walked up to a parked sheriffs squad car and opened fire, critically wounding two Los Angeles County deputies in an ambush recorded on surveillance video.

Officials asked for the publics help in identifying the gunman in a weekend ambush after officials offered a $100,000 reward for information leading to an arrest.

The 31-year-old female deputy and 24-year-old male deputy underwent surgery after the shooting Saturday evening and were expected to recover, Los Angeles County Sheriff Alex Villanueva said Sunday.

They performed in an admirable fashion in spite of grave adversity, Villanueva said during a conversation with local religious leaders. God bless them.

The deputies, who graduated together from the sheriffs academy 14 months ago, were shot while sitting in their patrol car at a Metro rail station and were able to radio for help, the sheriff said. The shooting took place in Compton, which is located about 15 miles south of downtown Los Angeles.

The department has faced criticism during recent protests over racial unrest but its unclear if that was a factor in the shooting. Officers have only a very, very generic description of the shooter to go on, officials said.

Surveillance video shows a person approach the parked patrol car on foot and shoot with a handgun through the passenger-side window.

The gunman walked up on the deputies and opened fire without warning or provocation, the department stated.