Officials: Marathon bombs triggered by remote

Officials: Marathon bombs triggered by remote

Credit: Associated Press

This image from a Federal Bureau of Investigation and Department of Homeland Security joint bulletin issued to law enforcement and obtained by The Associated Press, shows the remains of a pressure cooker that the FBI says was part of one of the bombs that exploded during the Boston Marathon. The FBI says it has evidence that indicates one of the bombs was contained in a pressure cooker with nails and ball bearings, and it was hidden in a backpack. (AP Photo/FBI)

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by Associated Press

kvue.com

Posted on April 24, 2013 at 1:46 PM

WASHINGTON (AP) -- 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.

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 (joh-KHAHR' tsahr-NEYE'-ehv), 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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