At least 5 people were injured at a downtown Los Angeles high school Friday afternoon when a student stabbed fellow students and a dean, said the LA Times.

Monica Carazo, a spokeswoman for the Los Angeles Unified School District, told CNN that a male student allegedly stabbed a female student with a sharp object during a lunchtime fight at South East High School in South Gate on the 2700 block of Tweedy Boulevard.

Carazo said a dean and a second student were then stabbed trying to break up the fight.

Ninth-grade student Giselle Noriega told the LA Times she was eating lunch when she saw a male student put a female student in a headlock.

“He was on top of her. It looked like he was shanking her or punching her,” she said.

According to LAUSD officials, the school was put on lockdown following the event and the victims taken to hospitals with one in critical condition.  The student who is suspected to have stabbed them was not injured and has been arrested, said Carazo.

The school was reopened later in the afternoon and students returned to class around 1 p.m., officials said.

Carazo added that no motive for the fight is known at this time, but an investigation is underway.

KTLA's Dave Mecham gave a video report from the scene.