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

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Mr. Phillipos, a U.S. citizen, went to high school with Mr. Tsarnaev and also attended UMass Dartmouth, former classmates said.

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All four had studied at UMass Dartmouth.

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According to the FBI account, just hours after surveillance camera photos of the two suspects were flashed around the world April 18, Tsnarnaev's friends suspected he was one of the bombers and removed the backpack along with a laptop from Tsarnaev's room at UMass Dartmouth.

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

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