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Wolf Blitzer delivers the most important breaking news and political, international, and national security stories of the day. Tune to The Situation Room weekdays 5-6:30pm ET on CNN.

April 16th, 2013
08:33 PM ET

Source: Bombs were in pressure cookers

CNN's Joe Johns looks at the nature of the explosives used in the Boston Marathon blasts.

RELATED: FBI releases new details on Boston bombs


Filed under: Boston Marathon bombings • Joe Johns
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