I’m thinking they wanted to Bomb MIT and that was why they stuck around. Not sure why MIT.
Once this guy is taken down, someone is going to have to explain how law enforcement let the younger brother escape from dozens of police officers last night. I have no doubt the individual officers did their best, but there was clearly a flaw in the operational planning if this guy could run the gauntlet and evade pursuit when it looked like half the Boston PD was present at the shootout.