Obama: Suspect capture is end of a chapter in tragedy

President Obama has said authorities who hunted down the Boston bomb suspect had "closed an important chapter in this tragedy" with his capture.

Speaking at a news conference, the president paid tribute to the police officer who died in yesterday's shootout at MIT campus and said "unanswered questions" remained as to the motivation of the suspected bombers.

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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.