ORIGINAL POST 10:51 AM: Twitter is tweeting about this right now: A pair of sources say that a suspect in the Boston Marathon Bombing has been arrested. Just a few minutes ago, the AP reported that an arrest was "imminent."
UPDATE 11:12 AM: Apparently, it hasn't been confirmed? NBC is saying they're not comfortable reporting that an arrest has been made. But the Boston Globe is saying that an arrest is imminent, and the AP is saying that a suspect is in custody.