Police officers locked down Sal Castro Middle School in Los Angeles after a shooting occurred in a classroom.
A 15-year-old boy hit in the head was transported to a trauma center in critical but stable condition, according to fire department spokesman Erik Scott.
The female suspected shooter, who authorities said was arrested, shot a male and a female student, both 15, the news channel reported.
"We know this a very traumatic incident for all the children involved, particularly inside that classroom", said Steven Zipperman, chief of the Los Angeles school system police department.
Police received a report of shots fired about 8:55 a.m. local time, according to LAPD Officer Drake Madison.
"The school has been declared safe at this point".
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Students are led away from the school after the shooting in Los Angeles. They were treated and released.
The motive is unknown, police said.
"He was in tears, but I'm so thankful he picked up the phone", she said of her call to him.
Sal Castro Middle School is near the city's Westlake district, roughly a couple of miles northwest of downtown, and it shares a campus with Belmont High School.
Student Melanie Valencia, 13, said the school did a random security search Thursday, but that she's never been checked. "You know what I mean, you really hear about things like this in the news, and just to hear that something like that happened so close to home, it scared the life out of me".