An explosion left multiple members of the Southern Californian Orange County Sheriff’s Department SWAT team hospitalized on Wednesday.

The team had been undergoing a training course at an FBI training facility with the sheriff’s bomb squad when the blast occurred, the department’s Sgt. Frank Gonzalez told AP. The explosion took place shortly before 1pm, and the cause was not immediately clear, he said.

At least 16 officers required hospitalization, but the worst injury was a non-life-threatening leg wound that will require surgery. Two officers sustained superficial wounds, while the rest suffered from dizziness.

The facility, located in a remote area of Irvine, south of Los Angeles, hosts firearms training and assessment for the FBI and local law enforcement. No FBI personnel were hurt in the incident, according to FBI spokesperson Laura Eimiller.

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