Investigators have reason to believe that at least one of the bombs was built utilizing a pressure cooker as the overall container for the bomb, black powder or gunpowder as the primary explosive ...

Gunpowder—as opposed to modern smokeless ... and that willow charcoal prepared in a closed container was far superior to oak charcoal made in a traditional pit." However, Riegner et al.

DEARBORN, Mich. (AP) — An oxen gunpowder container made in 1757 and stolen more than 60 years ago from a Detroit-area museum has been returned. The FBI turned the Nowlin Powder Horn over Tuesday ...