High School had been cleared; the lockdown was lifted about 90 minutes later.
"Unfortunately, that may be a result of why we were able to to put an end to this so quickly was this rapid deployment and rapid response", said Capt. Darren Harris of the Los Angeles County Sheriff's Department.
The high school was being searched by dogs trained to detect explosives, law enforcement sources told ABC News, as sheriff's deputies worked to calm anxious parents who had come to the school after social media reports of a shooting.
The father also said the boy's mother had called him earlier to say he ran away from the house.
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. Student Pualani Revis told KABC-TV that students ran into her classroom saying there were gunshots going off. The victim was shot in the arm and was transported by a nearby civilian to the hospital, where he is in stable condition, McDonnell said. The suspect fired about 10 rounds and told his father that he had fired into the air, McDonnell said. The sheriff's department said deputies were on scene searching the campus, and the Highland principal tweeted that people should "stay clear of campus" while authorities assessed the situation.
The sheriff said the boy is accused of attempted murder.
Lydia said she then heard two gunshots before she and her mom drove away.
"We barricaded the room", she said.
The school sign reads, "bully-free zone", at Highland High School where a shooting occurred on May 11, 2018 in Palmdale, California.
Faculty also provided surveillance video of the suspect arriving and leaving the school, which "assisted in the quick apprehension" of the suspect, McDonnell said. "I never knew it would happen to us here". Los Angeles police told CNN that they had responded to reports of a man with a gun on the campus. It underscored the national debate over gun control and gun rights that intensified after the February shooting deaths of 17 students and staff members at Marjory Stoneman Douglas High School in Parkland, Florida.