Explosives is categorized as high-explosives (HE) or low-order explosives (LE). HE produces a defining supersonic overpressurization shock wave. Examples of HE include Trinitrotoluene, nitroglycerin, dynamite, and ammonium nitrate fuel oil. LE create a subsonic explosion and lack HE's overpressurization wave. Manufactured (military) explosive weapons are exclusively HE-based. Terrorists will use whatever is available - illegally obtained manufactured weapons or improvised explosive devices (also known as "IEDs") that may be composed of HE, LE, or both. Manufactured and improvised bombs cause markedly different injuries Conventional explosives can generate casualties in several ways depending on the type of explosion, secondary effects of the explosion (e.g., building collapse, fire), and the surrounding environment of the explosion (e.g., confined spaces, availability of debris or materials to generate an expanding area of potential injuries). TICs may also be used as a source of highyield explosives (e.g., ammonium nitrate when mixed with diesel fuel). (JCS/DOD, CBRNE CM, 2006, I-10)