According to the affidavit, it contained the emptied fireworks, a jar of Vaseline and a UMass-Dartmouth homework assignment sheet from a class in which Dzhokhar Tsarnaev is currently enrolled.

NPR: Texts, TV, Then Trouble For Bombing Suspect's Pals

Inside was an assortment of fireworks, a jar of Vaseline and a homework assignment sheet from the University of Massachusetts-Dartmouth, among other items.

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Investigators found the backpack, fireworks and Vaseline in a landfill last week after a two-day search.

CNN: Feds search Boston bombing suspect's apartment