Four people were killed late Friday in what authorities believe was a gang-related shooting in the backyard of a Willowbrook home, officials said.

Los Angeles County sheriff's officials on Saturday were for looking for suspects in the shooting, which was reported about 8:45 p.m. in the 2100 block of Bliss Street.

Three of the victims were pronounced dead at the scene. A surviving victim was taken to a hospital and underwent surgery. He was pronounced dead early Saturday.

The identities of the victims have not been released, but they are said to be in their 20s.

Anyone with information is urged to call detectives at (323) 890-5500.

There have been four homicides in Willowbrook over the last six months, according to Crime L.A.

-- Larry Gordon

Photo: KTLA News

Crime in Willowbrook over last six months: