Boston Marathon Bombing

Prosecutors Preparing Charges Against Dzhokhar Tsarnaev

Could face the death penalty

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US federal prosecutors are preparing charges against the surviving Boston Marathon bomb suspect Dzhokhar Tsarnaev as more details emerge of his capture.

If he is charged with using a weapon of mass destruction to kill people, he could face the death penalty.

Mr Tsarnaev is in hospital, unable to speak because of a wound to the throat.

US media quoted anonymous sources as saying he had been responding to questions in writing, but this has not been officially confirmed.