A shooting at a bus stop in Los Angeles' Westlake District killed one person as investigators searched for two people responsible for the death, the Los Angeles Police Department said Wednesday.

A 19-year-old suspect was arrested in connection with a party shooting that left two people dead in Santa Clarita. The suspect was identified as Alejandro Trujillo, 19, of Newhall, according to the Los Angeles County Sheriff’s Department.

Details of Porter's killing have remained sketchy. According to the U.S. Department of Homeland Security, which oversees ICE, Porter was a suspected "active shooter" killed in an exchange of gunfire with the off-duty immigration agent who confronted him.

An investigation is underway in Paramount after a man was fatally shot on Monday evening, according to the Los Angeles County Sheriff's Department.