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“LAPD bomb squad has identified explosive material inside of the partially collapsed structure, some of which is black powder, which is known to be used in construction of illegal homemade fireworks,” Los Angeles Police Officer Drake Madison said in an email response Friday.

Among the dozens and dozens of weapons hanging on the wall for sale are double barrel black powder shotguns – akin to a musket – and a few "they-don't-make-these-anymore" Winchester rifles from the 1800s.

When law enforcement searched McGuire’s home, they found papers that appeared to be recipes for explosive material, an empty can with nails glued to the outside, a bag containing matches, black powder and fireworks, federal prosecutors said.

In a search of Nguyen’s residence, investigators found the ingredients needed to make black powder and other equipment and clothing believed to have been used in the attempted robberies, the U.S.

A mixture of potassium nitrate, charcoal and sulfur, black powder is a type of explosive that can be made simply at home with household products and other chemicals available online.