Dias Kadyrbayev, 20, is accused of removing a backpack containing emptied-out fireworks from Tsarnaev's dorm room after realizing he was suspected of carrying out the 2013 attack with his brother, Tamerlan Tsarnaev. Prosecutors said Kadyrbayev and another friend, Azamat Tazhayakov, decided to take the items from Tsarnaev's room at the University of Massachusetts-Dartmouth several days after two bombs exploded near the finish line of the marathon, killing three people and injuring more than 260. The items, along with Tsarnaev's laptop computer, were removed hours after the FBI publicly released photographs of Tsarnaev and his brother as suspects in the bombing. Prosecutors said the items were removed from Tsarnaev's room hours after Kadyrbayev received a text message from Tsarnaev saying he could go to his dorm room and "take what's there."