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Boston bombs 'remote trigger'

US investigators have revealed the two bombs that went off at the Boston Marathon were detonated with the kind of remote control device used for a toy car.

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Radical brand of Islam 'may have motivated suspects'

The two brothers suspected of bombing the Boston Marathon appear to have been motivated by a radical brand of Islam but do not seem connected to any Muslim terrorist groups.

The comments from US officials came after interrogating and charging Dzhokhar Tsarnaev with crimes that could bring the death penalty.

Bombing suspects Tamerlan and Dzhokar Tsarnaev Credit: FBI

19-year-old Tsarnaev was charged in his hospital room, where he is still in serious condition with a gunshot wound to the throat and other injuries suffered during his attempted getaway.

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