A US police chief has said the gunman who killed four people in a chaotic rampage planned the attack and had 1,300 rounds of ammunition.
Jacqueline Seabrooks said the gunman, who was killed by police in Santa Monica, California, had a rifle, a duffel bag full of ammunition magazines and extra weaponry.
She said the suspect had a run-in with police seven years ago, but she could not comment further because he was a juvenile at the time.
She spoke near a display of weapons and ammunition recovered from Santa Monica College where the killings ended when police fatally shot the gunman.
Ms Seabrooks said police are investigating 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.