Such weapons are brutally effective because they first disperse a gas or chemical agent which is lit at a second stage, allowing the blast to fill the spaces of a building or the crevices of a cave. When the US military deployed a version of these weapons in 2005, DefenseTech wrote an article titled, "Marines Quiet About Brutal New Weapon."
According to the US Defense Intelligence Agency, which released a study on thermobaric weapons in 1993, "The [blast] kill mechanism against living targets is unique--and unpleasant.... What kills is the pressure wave, and more importantly, the subsequent rarefaction [vacuum], which ruptures the lungs.… If the fuel deflagrates but does not detonate, victims will be severely burned and will probably also inhale the burning fuel. Since the most common FAE fuels, ethylene oxide and propylene oxide, are highly toxic, undetonated FAE should prove as lethal to personnel caught within the cloud as most chemical agents."
A second DIA study said, "shock and pressure waves cause minimal damage to brain tissue... it is possible that victims of FAEs are not rendered unconscious by the blast, but instead suffer for several seconds or minutes while they suffocate."
http://rawstory.com/news/2007/British_Army_deploys_new_weapon_based_0823.html
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