SKIPPACK, Pa. - Officials say three law enforcement agents were hurt when an explosion happened during a training exercise at a Montgomery County prison Thursday morning.Several emergency vehicles, including at least two fire trucks, swarmed a large field near SCI - Phoenix in Skippack Township just after 11 a.m.A fire official tells FOX 29 that an FBI agent, a state trooper and a sheriff's deputy were hurt in the explosion.
Two of the injured were airlifted to local hospitals, officials said.Authorities have not said exactly what caused the explosion.