Santa Monica's police chief says the gunman who killed four people in a chaotic rampage planned the attack and had 1,300 rounds of ammunition.
Chief Jacqueline Seabrooks says the gunman who was killed by police had a rifle, a duffel bag full of ammunition magazines and extra weaponry.
She says the suspect had a run-in with police seven years ago, but she couldn't comment further because he was a juvenile at the time.
She spoke near a display of weapons and ammo recovered from Santa Monica College where the killings ended when police fatally shot the gunman.
Seabrooks says police are probing the gunman's connection to a house where the killings began a mile from campus. She would not identify the killer but said he would have turned 24 on Saturday.