Boston Marathon Bombing

Officials: Marathon Bombs Were Remotely Triggered

Devices, however, were not sophisticated

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U.S. officials say the Boston Marathon explosions that killed three people and wounded more than 260 were triggered by a remote-controlled detonator.

Two officials on Wednesday said the bombs were not very sophisticated. One of the officials described the detonator as "close-controlled" — meaning it had to be triggered within several blocks of the bombs.