BOSTON, Aug. 13 (UPI) -- Two friends of Boston Marathon bombing suspect Dzhokhar Tsarnaev pleaded not guilty to federal obstruction conspiracy charges Tuesday.
College friends Dias Kadyrbayev and Azamat Tazhayakov are accused of disposing of evidence from Tsarnaev's dormitory room. The 19-year-olds from Kazakhstan could be sent to prison for up to 20 years if found guilty of the conspiracy charges.