After the three returned to Kadyrbayev's and Tazhayakov's apartment with the backpack and computer, they watched news reports featuring photographs of Tsarnaev.
The FBI has alleged that on April 18, just hours after surveillance camera photos of the Tsarnaev brothers became public, Tazhayakov and two other students went to Dzhokhar Tsarnaev's dorm room and removed his backpack and laptop computer.
Kadyrbayev said he took Tsarnaev's laptop computer too, because he felt Tsarnaev's roommate might get suspicious if they left with the backpack alone, the affidavit states.