Berkeley police are holding a man they say was in possession of explosives and the materials to make even more.
A 911 hang up call Saturday brought police to a home on Grizzly Peak Boulevard.
Inside, police say they found 27-year-old Emoru Oboke Obbanya acting suspiciously for no apparent reason.
Officers say a search of the home turned up several prohibited items including an illegal firearm, a destructive device, materials to make an explosive device and ammunition.
Police evacuated the home and neighboring homes while they called in a bomb squad and the University of California Police blast transport vessel to remove the items.
Obbanya is being held on $121,500 bail.
Police say they are still investigating what Obbanya was doing with all of the items.