His brother had lots of them, but fellow students at UMass-Dartmouth say he also hung out with some Russian speakers.

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Inside the backpack, they found fireworks, a jar of Vaseline and UMass-Dartmouth homework materials for classes in which Mr. Tsarnaev was enrolled.

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When the backpack was later found, inside it was a UMass-Dartmouth homework assignment sheet from a class Tsarnaev was taking, the FBI said.

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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.

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Mr. Kadyrbayev, who had known Dzhokhar Tsarnaev since 2011, told investigators the two met briefly April 17 outside the UMass-Dartmouth dorm, where Mr. Kadyrbayev noticed Mr. Tsarnaev had gotten a short haircut.

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The residence searched by the FBI is private off-campus housing for UMass Dartmouth students, Richard said.

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Peltz-Steele is a professor of law at UMass Law School Dartmouth.

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