The FBI has released photos of the remnants of one of the bombs that killed 3 and injured over 170 people at the Boston Marathon
The FBI says one of the bombs was carried in this black back pack.
A circuit board was found in the collection of bomb evidence.
The bomber may have been seen amid the Boston Marathon revelers carrying an unusually heavy nylon bag, weighed down with shrapnel-packed explosives, the FBI has suggested.
Officials found that the bombs in Boston consisted of explosives put in ordinary, 1.6-gallon pressure cookers, one with shards of metal and ball bearings.
Both bombs were stuffed into black bags and left on the ground.
The remnants of the pressure cooker seem to have identifying information.
ABC News reported a pressure cooker similar to this was used in the bombing.
Remnants of the pressure cooker that authorities say was used to house the bomb.
Investigators said they have not yet determined what was used to set off the explosives.
What appears to be a trigger mechanism for the device was found.
The bombs exploded 10 or more seconds apart
What appears to be a trigger mechanism for the bomb.
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