Los Angeles (CNN) -- One person was in critical condition, and at least three suffered minor injuries, after a stabbing Friday morning at a Southern California high school, fire and school officials said.
The Los Angeles County Fire Department and its ambulances were called around 11 a.m. to South East High School in South Gate, department Inspector Matt Levesque told CNN.
They arrived after a male student stabbed a female student with some sort of sharp object, said Monica Carazo, a spokesperson for the Los Angeles Unified School District.
A female dean of the school, as well as another student, who tried to intervene also were stabbed, added Carazo. Levesque said a fourth person was injured.
The school was locked down. Police from the city and the school district, as well as Superintendent John Deasy, arrived on the scene.
The male suspect is in police custody, according to Carazo.
Overhead video footage from CNN affiliate KTLA shows police calmly gathered at the scene, with yellow crime tape strung across a walkway to the school. Multiple ambulances come and go, and in one instance, an adult male places himself on a stretcher before being loaded into an ambulance.
South Gate is a city of about 100,000 people roughly eight miles south of Los Angeles.
CNN's Carey Bodenheimer and Rosalina Nieves contributed to this report.