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Officials: Marathon bombs triggered by remote

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WASHINGTON » 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 today 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.

Both U.S. officials are close to the ongoing investigation but spoke on condition of anonymity because they were not authorized to discuss it publicly.

It was not immediately clear what the detonation device was.

A criminal complaint outlining federal charges against the surviving bombing suspect, Dzhokhar Tsarnaev, described him as holding a cellphone in his hand minutes before the first explosion.

Cellphones have been used to trigger bombings in war zones.

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