CNN The Situation Room April 16, 2013 21:06:00
Whatever they did this was an anti-personnel device and accomplished the mission. you don't have to have a high tech. you don't have to use high explosive, military explosives. >> reporter: the pressure cooker bomb is not new. plans for this kind of thing are on the internet making tracing the bomb style to a specific group or individual more difficult. the failed terrorist who tried to blow up times square in 2010 tried a variation on the idea but it didn't work. and pressure cooker style bombs are a common form of ied used in both afghanistan and iraq made famous by this english language art...
Source: archive.org