This was on the front page of my newspaper today. I tried to find an online link for it, found paywalls so you'll have to look into it yourself. The article says, in part, the individual was described as anti-government and a doomsday prepper. The guy called 911 because a blasting cap went off in his hand. Which caused police to get a warrant to search his car, which in turn yielded what was ID'd as a live grenade. His car was parked in the Aerospace Machinist's union lot.