The FBI searches Dzhokhar Tsarnaev's dorm room in Pine Dale Hall, on the campus of the University of Massachusetts-Dartmouth. Among other things, they seize BB's, "a large pyrotechnic," as well as a black jacket and white hat like those worn on Marathon day by the man referred by authorities to as "Bomber Two."
Law enforcement agents recover Tsarnaev's backpack at a New Bedford landfill. Inside, they find an assortment of fireworks, a jar of Vaseline, a homework assignment sheet from the University of Massachusetts-Dartmouth and other things.
Federal authorities announce charges against three of Dzhokhar Tsarnaev's friends.
Azamat Tazhayakov and Dias Kadyrbayev are charged with having willfully "conspired with each other to commit an act against the United States ... by knowingly destroying, concealing and covering up objects belonging to Dzhokhar Tsarnaev."
Phillipos is charged with having "knowingly and willfully (made) materially false statements to federal investigators."