BOSTON (AP) — The FBI has concluded its search of a landfill near a Massachusetts college where the 19-year-old suspect in the Boston Marathon bombings was a student.

FBI spokeswoman Laura Eimiller says the two-day search ended Friday. Eimiller wouldn’t say what investigators were looking for or whether they recovered anything from the landfill.

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Bombing suspect Dzhokhar Tsarnaev was a sophomore at the University of Massachusetts-Dartmouth. Students say he returned to the campus after the bombings.

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Two of his college friends were detained April 20 and were being held at a Boston jail for violating their student visas by not regularly attending classes. A lawyer for one says the two students have been interviewed by FBI agents, cooperated fully and aren’t suspects in the attack.

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Copyright 2013 The Associated Press.