BOSTON - An FBI affidavit lays out how three college friends of the Boston Marathon bombing suspect now find themselves facing charges.
The document based on interviews with the young men says Dzhokhar Tsarnaev had told two of them about a month before the marathon that he'd learned how to make a bomb. But the men say they didn't connect Tsarnaev with the bombing until they saw his picture on TV three days after the attack.
The FBI says that prompted them to try to get rid of their friend's backpack, which contained fireworks that had been emptied of their gunpowder, and his laptop.
Two of the three are from Kazakhstan. Azamat Tazhayakov and Dias Kadyrbayev have been held in jail for more than a week on allegations they violated their student visas by not regularly attending class at the University of Massachusetts at Dartmouth. They are now charged with conspiring to obstruct justice by concealing and destroying evidence.
The third man is identified as Robel Phillipos. He's charged with making false statements to federal investigators.
The three are not accused of any role in the bombing.
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