JUST IN: At least three people were killed in an apparent “horrific incident” at a Los Angeles law enforcement training facility, Attorney General Pam Bondi said.

MONTEREY PARK, Calif. (KABC) — A deadly explosion at a Los Angeles County Sheriff’s Department training facility in Monterey Park left three deputies dead Friday.

The incident, which is believed to be an accident at this time, was reported just before 7:30 a.m. at a LASD compound. It is believed to be the compound that houses the sheriff’s department’s special enforcement units and bomb squad.

It appears the sheriff’s enforcement bureau personnel were handling some kind of explosives when there was a blast, according to preliminary information from sources. Three deputies were killed in the incident.

The Los Angeles County Fire Department responded to the scene. It’s unclear if there were any other injuries.