SANTA CLARITA, Calif. (AP)

Authorities say a second victim of a Los Angeles area high school shooting has died.

Los Angeles County Sheriff Alex Villanueva says a 14-year-old boy died at a hospital. Earlier, a 16-year-old girl died from the shooting at Saugus High School in the city of Santa Clarita.

Authorities say a student gunman shot five students and then himself around 7:30 a.m. in a school quad. His .45-caliber handgun was found with no bullets remaining when it was recovered.

The three surviving victims remain hospitalized. The shooter is in grave condition.   He is a 16-year-old boy, and officials said Thursday was his birthday.   He was found among the other victims, and a video showed him turning the gun on himself.