LAPD Cmdr. Andy Smith said the officer, whose name is not being released, has been riding motorcycles for about 20 years.
The motorcycle officer was stopped at a traffic light at the intersection of Lankershim Boulevard and Saticoy Street when a red SUV rammed him from behind and pinned him to the car in front. The incident occurred at around 5:30 p.m. on Saturday, Smith said.
The officer remained in critical condition late Saturday night at a local hospital, where he is undergoing surgery. He is surrounded by his family, and about 50 police officers are awaiting news about his condition, Smith said.
The driver and a passenger in the vehicle that struck the officer from behind are being detained for questioning and possible criminal charges, Smith said.