(Associated Press) With the Boston marathon bombing suspect in a prison hospital, investigators are pushing forward in the U.S. and abroad to piece together the myriad details of a plot that killed three people and injured more than 260.

FBI agents have wrapped up a two-day search at a landfill near the University of Massachusetts Dartmouth, where 19-year-old suspect, Dzhokhar Tsarnaev, was a sophomore. FBI spokeswoman Laura Eimiller wouldn’t say what investigators were looking for or whether they recovered anything from the landfill before the search ended Friday.

A federal law enforcement official not authorized to speak on the record about the investigation told The Associated Press on the condition of anonymity on Friday that the FBI was gathering evidence regarding “everything imaginable.”

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