Police in the US have identified the gunman in an unexplained shooting rampage in Southern Californai as a 20-year-old unemployed part-time student.
Tustin police Chief Scott Jordan said Ali Syed lived at the Ladera Ranch residence where the first victim was slain.
Orange County sheriff's spokesman Jim Amormino said that victim was a young woman aged in her 20s who had not been identified and was not related to the shooter.
The rampage left three people dead and several others wounded. The shooter killed himself.