Police say they don't know what motivated a former US Marine to kill 12 people in a bar in California.
Ian David Long opened fire at a student night in Thousand Oaks, before turning the gun on himself.
Authorities have confirmed he had mental health tests after a disturbance in April.
Meanwhile, hundreds attended a vigil overnight for those killed.
Among them was Alexis Tait - she survived the shooting, but three of her friends didn't.