Southern California law enforcement authorities have identified the gunman in an unexplained shooting rampage as a 20-year-old unemployed part-time student.

Tustin police Chief Scott Jordan says Ali Syed lived at the Ladera Ranch residence where the first victim was slain.

Orange County sheriff's spokesman Jim Amormino says that victim is a young woman in her 20s who has not been identified and is not related to the shooter.

The rampage early Tuesday left three victims dead and several wounded. The shooter killed himself.

(Copyright 2013 by The Associated Press. All Rights Reserved.)

Previous Story

Authorities say a shooting spree through Orange County, Calif., left four people dead, including the shooter, and several others injured.

Orange County sheriff's spokesman Jim Amormino said Tuesday the shootings began at 4:45 a.m. when deputies responding to a call found a female shot multiple times in a house in Ladera Ranch.

Three more people were fatally shot in the next 25 minutes after carjackings in Tustin and Santa Ana.

Amormino says the suspect shot himself at an intersection in Tustin.

The motive for the shootings is still unclear and it's also unclear if the victims knew each other or the shooter.

(Copyright 2013 by The Associated Press. All Rights Reserved.)