At least two students have been killed and 13 others injured in a shooting Monday morning at Santana High School in Santee, California, a suburb of San Diego.
Authorities have arrested a 15-year-old boy who was a ninth grader at the school, according to San Diego County District Attorney Paul Pfingst. Police believe the student was the lone gunman, opening fire on students and school staff just as classes were changing at 9:20 a.m. PT.
A police spokesperson said one student was found dead at the scene, while a 15-year-old boy died after being taken to nearby Grossmont Hospital, according to CNN. Most of the others injured in the shooting were also students, although several adults, including a school security guard, a guidance counselor and a sheriff's deputy, were also shot during the rampage.
Authorities have not yet identified the suspect, who apparently loaded a .22-caliber revolver in one of the boys' bathrooms and was smiling as he began indiscriminately shooting at people in the 2,000-student Santana High.
Sheriff's Deputy Ali Perez, one of the first officers on the scene, said the shooter was apprehended in the bathroom after dropping his weapon, surrendering to authorities and telling them, "It's only me."
Pfingst said the suspect will be arraigned in a juvenile court on Wednesday. He faces charges of murder, assault with a deadly weapon and weapons possession. Pfingst said that although legal proceedings will begin in juvenile court, he expects the suspect ultimately will be tried as an adult.
Authorities have yet to determine a motive in the shooting, Pfingst said, despite comments the suspect has made to those investigating the case.
"There's no real answer," Pfingst said. "I'm not sure, in any real way, that we'll ever know why [this happened]."
Josh Stevens, a student who claimed to be one of the suspect's best friends, told Reuters the suspect had talked over the weekend about shooting several people and then fleeing to Mexico, but said he thought his friend was just joking.
Chris Reynolds, a father of one of the suspect's friends, described the shooter to local TV station KGTV as someone who was picked on often but who usually laughed off the harassment.
The suspect had apparently slept over at Reynolds' home over the weekend, and Reynolds asked him if he was serious about going ahead with the shooting. "No, I'm not stupid," the suspect said, according to Reynolds.
Reynolds also said another friend of the suspect even patted him down on the way to school Monday morning to see whether he was carrying a gun, but didn't find anything because the weapon was hidden in a backpack.
Openly discussing violent plans is one of the key warning signs in spotting potential violent behavior in friends and classmates or even yourself. For more on the signs and what you can do to help curb violence, tune in to the "Warning Signs" special, part of MTV's continuing "Fight for Your Rights: Take a Stand Against Violence" campaign, airing on Monday night at 11:30 p.m. ET/PT and Tuesday at 8:00 p.m. ET/PT.