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      Slideshow: Bomb Crime Scene Photos

      The FBI released images of one of the devices that exploded at the Boston Marathon.

      Investigators say the pictures show the remains of a pressure cooker that contained a bomb.

      One photo shows a shredded black backpack and what appear to be metal pellets or ball bearings.

      A Boston law enforcement source said two identical pressure-cooker bombs -- each with the capacity to hold six liters of liquid -- were set off.

      The FBI said they contained BB-like pellets and nails, causing even more damage.

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