Boston Marathon bomber's friends sentenced for hampering probe

By Scott Malone BOSTON (Reuters) - Two college friends of the Boston Marathon bomber were sentenced to prison on Friday for removing a backpack containing empty fireworks shells from Dzhokhar Tsarnaev's dorm room amid a massive manhunt three days after the deadly 2013 attack. Kazakh exchange student Azamat Tazhayakov was sentenced to 3-1/2 years for obstructing justice by taking, with his roommate, Tsarnaev's pack and dropping it in a dumpster by the off-campus apartment they shared. R