PRESSURE COOKERS COMMON FOR BOMBS
Explosives manuals involving pressure cookers such as those reportedly used in the bombings in Boston have been distributed on jihadist forums in the past years and most recently appeared in an al-Qaeda in the Arabian Peninsula (AQAP)-produced compilation called the "Lone Mujahid Pocketbook", reports the SITE Intelligence Group.
A manual for a homemade explosive using a pressure cooker with shrapnel inside was featured in the widely-distributed first issue of AQAP's English-language magazine, "Inspire." The article in which it appeared, "Make a Bomb in the Kitchen of Your Mom," also shows a picture of a backpack concealing the explosive.
The first issue of "Inspire," and its manuals section in particular, was also discussed among white supremacists, who found it and other al-Qaeda manuals beneficial for their strategies, reports SITE. One such discussion took place on the popular forum Stormfront in September 2011, where members distributed copies of the manuals and one called them "highly recommended reading".