Updated at 8:20 p.m. ET

Two students have died after a gunman opened fire Thursday morning at Saugus High School in Santa Clarita, Calif., according to law enforcement officials. Three other students also were shot.

Authorities have not named the suspect but say he is a 16-year-old student at the school. He carried out the attack on his birthday.

In a late afternoon news conference, Capt. Kent Wegener of the Los Angeles County Sheriff’s Department’s Homicide Bureau said an Instagram account believed to belong to the suspect said,