Boston Marathon attack: FBI releases photos of Boston bomb device

The FBI has released images of what they say is one of the devices that exploded at the Boston Marathon Monday.

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

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

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

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

Three people were killed and more than 180 injured in the attack.

13 of the injured had limbs amputated.

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