Authorities say they are trying to figure out why a 14-year-old boy went to his former high school Friday morning and began shooting a semiautomatic rifle shortly before classes were scheduled to begin.
The department added that the suspect was arrested off-campus and a rifle was recovered off-campus, and the shooting appears to be an isolated incident with no further threats to the community.
"We are incredibly grateful for the actions of Highland High School teachers and staff and our first responders who courageously protected the lives of our students today", Brett Neal, an assistant superintendent for the school district, said in a statement.
Meanwhile, the Sheriff's Department searched the campus of Manzanita Elementary School in Palmdale, about 6 miles east of Highland High, after a report of "shots heard". Deputies searched the scene and found the report to be unfounded.
McDonnell said it is unclear whom the suspect was aiming at, stating that he "fired the rounds and deliberately left the campus".
"This is ridiculous - there's too many school shootings", said parent Tracy Reed, whose son texted her about the shooting at his school.
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She says there's no information about that caller and no confirmation of the report.
Authorities responded within five minutes and later learned that a 14-year-old student with a rifle had fired and struck another student, also 14, in the arm, Harris said. The term "active shooter" was a focus in much of the reaction, though authorities initially told KTLA they were not describing the situation that way. He said the teen's father called a family friend who's an off-duty police officer and told him where the boy was.
Lydia Gilbert, a junior at Highland, said her mother was dropping her off when a student ran up and warned her there was a shooting. He said he heard one shot and turned.
A 15-year-old boy was shot in the head and a 15-year-old girl shot in the wrist at Sal Castro Middle School in Los Angeles on February 1, officials said.
Investigators say the shooting stemmed from a dispute between the 14-year-old and the victim.
Palmdale is north of Los Angeles in the high desert Antelope Valley.