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NBC News said law enforcement officials told them an improvised explosive device was found attached to Tamerlan Tsarnaev's chest. And the Boston Globe, citing its own law enforcement source, said an explosive trigger was later found on Tamerlan Tsarnaev's body at the morgue.

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Update:

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Update: Doctors have said that Tamerlan Tsarnaev also had injuries that were indicative of an explosive blast, perhaps from shrapnel. It is not known if those injuries resulted from an explosive device that was on his body.

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[NBC News/New York Times/Boston Globe]