Boston bombs triggered by remote controls from toy cars, FBI says


WASHINGTON -- Investigators believe that the two homemade bombs used in the Boston Marathon blasts were triggered by long-range remote controls for toy cars.

A joint FBI and Department of Homeland Security intelligence bulletin sent to state and local law enforcement Tuesday night said the bombs likely included components taken from remote-controlled toy cars, and were more sophisticated than previously believed.

After combing the blast sites on Boylston Street for evidence, investigators have finished a preliminary reconstruction of the bombs that killed three people and injured more than 260 runners and bystanders near the finish line of the Patriots Day race on April 15.


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“Based on preliminary analysis of recovered evidence, each device likely incorporated an electrical fusing system using components from remote control toy cars such as a transmitter and receiver pair operating at 2.4 GHz, an electronic speed control used as the switch mechanism and sub-C rechargeable battery packs at the power source,” read the bulletin, according to an official.

Both pressure cooker bombs used a low explosive mixture that incorporated nitrate and perchlorate-based oxidizers, the bulletin said. Investigators don’t know if the explosive was purchased that way or was mixed from different sources. The shrapnel included BBs and carpenter nails.


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