(CNN) — Investigators said Tuesday they’ll attempt to reconstruct the bombs that turned the Boston Marathon’s finish line into a bloody nightmare and asked the public for help finding whoever planted them.
Federal law enforcement sources told CNN the devices were made from pressure cookers and hidden in backpacks.
At a news conference Tuesday evening, the FBI agent leading the search said fragments of nails, BBs and scraps of black nylon — possibly from a backpack — are being handed over to the bureau’s laboratory “for a complete and thorough analysis.”
Rick DesLauriers, the special agent in charge of the FBI’s Boston office, also asked people to report anyone who talked about targeting Monday’s race or showed interest in explosives. He urged anyone who might have heard the sounds of explosions in remote areas or saw someone…
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