Authorities in Boston plan a "controlled explosion" Friday afternoon to destroy suspicious material found during the hunt for bomb suspects Tamerlan and Dzhokar Tsarnaev.
Police say the scheduled detonation is the safest way to neutralize any possible threat posed by the material. They would not specify what kind of material they had found.
The planned blast will come after a night and day filled with rapid-fire developments in the hunt for the two suspects -- later identified as brothers Tamerlan and Dzhokar Tsarnaev -- in the Boston Marathon bomb attacks that killed three and left scores of others gravely hurt.
Older brother Tamerlan, 26, died after a shootout with police overnight in Boston. Younger brother Dzhokar, 19, remains at large and is the subject of a massive dragnet that has virtually locked down the city.
The overnight violence, which began with a convenience store robbery, killed a campus officer at the Massachusetts Institute of Technology. Another officer was wounded.
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