Who bombed Boston? Deadly device used pressure cooker, source says

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Boston Marathon Explosives
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Boston Marathon Explosives
This Homeland Security Department pamphlet, from July 2010, distributed to police, fore, EMS and security personnel 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. (AP Photo/Homeland Security Department)