While investigators have not yet publicly revealed the alleged conduct of the three new suspects arrested in connection with the Boston Marathon bombings, they are focusing on whether the three aided accused bomber Dzhokhar Tsarnaev, according to NBC News' Pete Williams.
Williams reported on Wednesday that the suspects were roomates of Tsarnaev. Two of the roommates were already in custody related to immigration violations and the third was arrested Wednesday morning, according to Williams.
"The question is whether they helped to take things out of Dzhokhar Tsarnaev's dorm room after the bombing," Williams said on-air, according to a rush transcript. "Now, no one is saying at this point that they have knowledge of the bombing in advance. That's been the big question. We'll probably learn more about the answer to that question later today when these charges are made public."
CBS News reported that the suspects were arrested for allegedly "harboring or aiding the two brothers" after the bombing. According to CBS, federal charges are pending.
This post has been updated.