Terrorists could use the explosive Hexamethylene Triperoxide Diamine (HMTD) in an attack against the United States. Terrorist training manuals have included information regarding the production and use of HMTD as components of an explosive device. HMTD can be made from hydrogen peroxide, hexamine, and citric acid or diluted nitric acid. These ingredients are widely available in drug stores, hardware stores, and camping supply stores. HMTD is extremely sensitive to impact, friction, static/sparks, and heat, and may react violently to drug field testing if large amounts are tested at once.