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Boston bombs 'trigged remotely'

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Tamerlan Tsarnaev, left, and brother Dzhokhar Tsarnaev (AP/The Lowell Sun and Robin Young)

Tamerlan Tsarnaev, left, and brother Dzhokhar Tsarnaev (AP/The Lowell Sun and Robin Young)

AP/Press Association Images

People attend an interfaith service held near a makeshift memorial on Boylston Street, near the finish line of the Boston Marathon (AP)

People attend an interfaith service held near a makeshift memorial on Boylston Street, near the finish line of the Boston Marathon (AP)

AP

Officers at the scene of Dzhokhar Tsarnaev's arrest in Watertown (AP)

Officers at the scene of Dzhokhar Tsarnaev's arrest in Watertown (AP)

AP

Tamerlan Tsarnaev, left, and brother Dzhokhar Tsarnaev (AP/The Lowell Sun and Robin Young)

The Boston Marathon explosions which killed three people and injured more than 260 were triggered by a remote-controlled detonator, US officials have said.

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

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 mobile phone in his hand minutes before the first explosion.

Mobile phones have been used to trigger bombings in war zones.


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