By News Staff
Three college friends of Jahar Tsarnaev have been arraigned in US District court in Boston on charges they helped him cover his tracks in the Boston bombings.
All three pleaded not guilty to obstruction of justice charges.
Two of the friends have already pleaded not guilty to getting rid of evidence from Tsarnaev's dorm room at UMASS Dartmouth.
The third friend has also been indicted for lying to authorities. If convicted they face up to 20 years in prison.
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