Defense Tech has thoughts on thermobaric bombs:

Thermobaric bombs, which the U.S. military is striving to perfect, may also be emerging as a weapon of choice for terrorists, according to a bomb expert at Battelle, a research institute…

There have been no attacks with thermobaric bombs in the United States, but their use is suspected in many terrorist bombings in Russia and other countries — and proven in a few cases, said Tom Burky, Battelle’s top explosives expert.

Thermobarics use an explosion to ignite fuel, often metallic fuel such as aluminum. The burning fuel creates a slower and more sustained shock wave than a conventional explosion, which makes it better at breaking down walls and destroying people and equipment, Burky said.

Hat tip to TCS.