The four suspects were booked for suspicion of attempted murder of a peace officer at the Century Regional Detention Center in Lynwood, according to a department statement.
The shooting in the 1600 block of 81st Street near Parmelee Avenue was reported at 9:32 p.m. Friday, sheriff's deputies said.
Gang enforcement deputies from Operation Safe Streets were trying to contact a group of five to 10 males. All suspects fled on foot. Three or four of those suspects fired at deputies. Deputies returned fire, according to the statement.
The wounded deputy, shot once in the abdomen, was said to have stable vital signs early today after undergoing surgery at a hospital, Deputy Nicole Nishida said.
He was taken to St. Francis Medical Center in Lynwood, according to broadcast reports.
His name was being withheld. Sheriff Lee Baca said the deputy had a frail mother and wanted to tell her himself.
At least five suspects were being sought, according to the sheriff's department.
Sheriff Lee Baca, who went to the hospital to check on the deputy, told ABC7 the suspects were members of a black gang "that's rather renowned for its violence."
More than 100 deputies and other law enforcement personnel were involved in the search.
"Someone willing to shoot a uniformed deputy sheriff is capable of shooting anyone," Sheriff's Capt. Mike Parker tweeted.
Numerous vehicles from the sheriff's department and other law enforcement agencies were gathered at a command post at 7901 Compton Ave.
"We'll eventually catch these suspects. It never fails that we eventually find out who they are," Baca told Channel 7.
Deputies asked anyone with more information about the shooting was to
call detectives at (323) 890-5500. Anonymous tips can be made by calling Crime
Stoppers at (800) 222-TIPS.