Terror arrest?

Ibragim Todashev was shot to death by the FBI while being questioned on May 22 about his connection to the Boston bombing. His roommate was arrested today, on what police say is an unrelated matter.

One of the comments on the story nails it:

They all ... come from the same terrorist region and enter the country supposedly to go to college. They attend a few months then drop out. [W]ho knows what they are up to. How long will the US government allow this to continue?