FBI: Pressure Cooker Parts, BBs Found in Tsarnaev Family Home

New surveillance photos have been released of Tamerlan Tsarnaev less than 24 hours before the Boston Marathon bombings.

FBI Special Agent Christian Fierabend testified the photos show Tamerlan Tsarnaev at a Target store in Watertown, Massachusetts, carrying out a shopping bag containing a purchase of two backpacks matching the brands of the backpacks found at both explosion sites on Boylston Street.

Agent Fierabend also testified the bombers used Fagor Elite pressure cookers, sold exclusively at Macy's, on both Boylston Street and in the Watertown firefight.

He said investigators were able to determine only three of the 4-quart Fagor Elite pressure cookers were purchased with cash in Massachusetts and he was able to use the Tsarnaevs' GPS device to put them at the Square One Mall in Saugus, when one of those 4 quart pressure cookers was purchased, along with another 6 quart pressure cooker.

Jurors also saw the more than 100 pieces of evidence seized from the Tsarnaev family home at 410 Norfolk Street in Cambridge.

That evidence included this black flag with foreign writing on it hung in a bedroom identified as Dzhokhar's.

Also in that bedroom were gun lubrication, a gun cleaning brush and cloth, BB gun targets, gorilla glue and a caulking gun.

In the kitchen of the third floor apartment, jurors saw a drawer full of a number of tools, along with hobby fuse, the top of a pressure cooker lid, and a pressure cooker gasket.

And in the living room, a BB gun target against a book shelf that had been shot up, surrounded by BBs all over the floor.

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