5:40 p.m. (EST): Boston police have denied earlier reports from The New York Post (see below) that a suspect was in custody. "At this time, we haven't been notified of any arrests or anyone apprehended," said a spokesperson. "Honestly, I don't know where they're getting their information from, but it didn't come from us."
5:30 p.m.: The New York Times published an overhead map
This is why Anderson Cooper is the best at what he does. He's broadcasting live from Geza, bomb explodes in the background and comments on it. If I were there, I'd take off my mic and say, "Well, this is when I never do this ever again," and retire.