The former boyfriend of a woman killed in an explosion in Aliso Viejo has been arrested.
Stephen Beal, 59, of Long Beach, was arrested on suspicion of being in possession of an unregistered destructive device, according to FBI spokeswoman Laura Eimiller. He has not been charged in connection with the explosion.
Investigators confirmed Wednesday they do not believe the medical building blast “was an accident” and that some type of explosive device was used. They do not know how the device arrived at the building.