While searching the garage, investigators found a cooler full of a white, cake-like explosive material known as HMTD, or hexamethylene tiperoxide diamine, according to a criminal complaint filed in U.S. District Court. Nearby, they found explosive precursors chemicals that can be mixed to create explosives including potassium chlorate, potassium nitrate, nitro methane and more than a pound of ammonium nitrate in a package addressed to Russell.
Investigators also found electric matches and empty 5.56-caliber ammunition casings with fuses that could be used to detonate destructive devices once HMTD was added to the casings. The materials could be used to make a bomb, according to the complaint.