Four teenage students were shot in the shared parking lot of two San Francisco high schools, and one of the students is in critical condition, US authorities said.
The shooting (Tuesday local time) occurred as students were being let out of school for the day from the June Jordan School for Equity and City Arts and Technology High School, which share a campus.
Three of the victims ran inside the school, and police initially ordered students to stay in place until police searched each room and determined it was not an active shooter situation.
A fourth victim hurt in the shooting went to the Bayview Police Station, San Francisco Police Officer Carlos Manfredi said.
Four male suspects wearing dark hoodies and jeans were seen running away from the area, Manfredi said.
The shooters, who are not students at the school, seemed to have targeted the female student, officials said.
"This was an isolated incident outside of the school building where one student was being targeted by outsiders," the San Francisco Unified School District said in a statement.
Classes at June Jordan School in the city's Excelsior District will resumed and extra security and counselors for students will be available, it said.