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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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Report: 'At least 15' police officers injured in manhunt

A Boston hospital said at least 15 police officers were wounded during last night's pursuit of terror suspects, local radio station WBUR reported.

The officers has mainly suffered "abrasions, bruises, strains, sprains and fall injuries" and most had been discharged, the station quoted St. Elizabeth's Hospital spokesman Chris Murphy as saying.

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