BREAKING: ARREST IMMINENT
UPDATE: 3:56:
This will be the last update of this article this afternoon. There is a press conference with the FBI at 5P, after which we'll publish a new article recapping the details. What we do know as fact is that the FBI and has made "significant progress" in this investigation.
UPDATE @ 3:02:
The Boston police department has tweeted that there HAS NOT been an arrest made:
UPDATE @