I have two questions, maybe someone here knows:
1) what did the brothers study? Were they techies? Did they have a natural talent that would make them able to build bombs and circuit boards etc from scratch without actual help, only with reading online?
2) almost everybody, especially young people, nowadays has a cell phone or smart phone on them at all times. Did DT have one on him? Did he call or text someone when he was lying injured in the boat for roughly 20 hours or so? I would feel surprised if he didn't. He must have been in pain, hungry, thirsty. Was he just lying there waiting to die? I would rather think he was waiting to gather some strength and make his way in the dark to some friends or so. Did he know Boston was shut down and the area was swarming with 100s or 1000s of police? What was his plan? What was he gonna do without help?
If I would make a guess I'd say there will be more arrests in this case. Someone knew, if not before the attacks but afterwards. And they didn't call police.
1) Older brother was taking engineering classes in some community college. Still not sure about younger one, heard it was biology/medicine/nursing.
2) If the younger one had a cell phone with him, presumably LE could have tracked him. Since they didn't, I assume he threw the cell phone away/didn't have it with him.