AP: Explosives Used in Bombings Contained in ‘Pressure Cookers’ and Placed in Duffel Bags — Same Type Described in How-To Section of Al-Qaeda Mag | TheBlaze.com

“Pressure cooker” bombs have been in the news before. As the Christian Science Monitor noted in July 2011, when Army Pfc. Naser Abdo was caught plotting to blow up Ft. Hood, he was caught with plans to make such bombs — instructions he got from an al-Qaeda magazine."