A candlelight vigil is planned to remember two students shot and killed by a classmate at his Southern California high school as investigators try to determine what prompted the deadly attack that left three other teens wounded.
Saugus High School will remain closed until December 2, but counsellors will be available to help students cope with their grief, school district officials said in the Los Angeles suburb of Santa Clarita.
Detectives were searching for a motive for the killings carried out by Nathaniel Tennosuke Berhow on Thursday, his 16th birthday.
The teen pulled a .45-calibre handgun from his backpack and shot five students at random before shooting himself in the head. He died the next day.
Fifteen-year-old Gracie Anne Muehlberger and 14-year-old Dominic Blackwell will be honoured at a Sunday night vigil at Santa Clarita's Central Park.
A wounded 14-year-old girl was released from the hospital late on Friday, while a 15-year-old girl remains hospitalised in good condition and a 14-year-old boy was treated and released on Thursday.
Berhow had shown no signs of violence and didn't appear to be linked to any ideology, authorities said.
After more than 40 interviews and a search of his home, authorities remain in the dark, the Sheriff's Department's homicide unit said on Friday.
"We did not find any manifesto, any diary that spelled it out, any suicide note or any writings," he said.
Meanwhile authorities were investigating online threats against schools in and around the Santa Clarita, sheriff's officials said on Sunday.
Australian Associated Press