The Tribune Democrat, Johnstown, PA

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Boston pressure cookers.jpg

This Homeland Security Department pamphlet, from July 2010 shows a diagram for rudimentary improvised explosive devices (IEDs) using pressure cookers to contain the initiator, switch and explosive charge. A person briefed on the Boston Marathon investigation says at least one of the explosives were in 6-liter pressure cookers and placed in black duffel bag.

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