Police have removed three bodies from the apartment of a 22-year-old Californian man after a killing rampage that left six dead and seven in hospital.
The killer, Elliot Rodger, died after an exchange of gunfire with police. Authorities said he apparently killed himself.
The three bodies removed from his apartment are believed to be among the six confirmed dead.
They were reported to have been stabbed, while the other three were shot elsewhere.
Sheriff Bill Brown described the mass killing as a "rapidly unfolding convoluted incident", which covers "multiple crime scenes".
The gunfire continued for 10 minutes as the gunman made his way through the beach community in a rampage that mirrored threats made on a YouTube video posted the same night, authorities said.
Police confirmed Rodger, the son of a Hollywood film director, Peter Rodger, was the gunman.
According to US media reports, a 140-page "manifesto" outlining his plans was retrieved from the apartment. In it he described his "day of retribution".
He also posted a series of videos on social media, concluding with one titled Retritbution, in which he graphically described his resentment and frustration.
"You forced me to suffer all my life, now I will make you all suffer. I waited a long time for this. I'll give you exactly what you deserve, all of you," he said.
"All you girls who rejected me, looked down upon me, you know, treated me like scum while you gave yourselves to other men.
"And all of you men for living a better life than me, all of you sexually active men. I hate you. I hate all of you. I can't wait to give you exactly what you deserve, annihilation."
He was enrolled in Santa Barbara City College.
Police have not released the names of the victims, but three families have identified their children as among those killed: Veronika Weiss and Katie Cooper, both 19, and Christopher Martinez, 20.
According to police, Rodger's body was found with a semi-automatic handgun. He also had more than 400 rounds of unspent ammunition in his car.
- with AP