An IED was found during a search this week at Victorville Federal Penitentiary during a "routine search of inmate property" said Traci Billingsley a Bureau of Prisons spokesperson. She also said that the device "detonated upon discovery."
Though it was stated that the incident was not terrorist related, and no one was injured in the blast, it is not 100% clear if it was intended to injure one of the guards.
San Bernardino County Sheriff's Department and the FBI bomb squads wree called to the scene to ensure that the device didn't pose any further danger.
FBI spokeswoman Laura Eimiller said an investigation was under way.
Billingsley said the prison was locked down at the time the device was found. She could not say what prompted the lockdown, or if there was any connection to the search. No inmates were in the area when the explosion occurred.
"The prison remains secure," she said.