UPDATE - 8:44 PM EDT - Per Fox News, suspect in custody.
Breaking now. Via twitter, News reports and people on Twitter are reporting many gunshots.
Reports on Twitter and Fox News are second bombing suspect is down after hiding in a boat.
Overhead shot of scene:
20 to 30 shots were fired and bomb squad is being called in.
7:28 pm Suspect alive, surrounded and moving
8:44 PM - Just heard suspect number two is now in custody.