The story took a turn late last night (April 18th) when the two suspects robbed a 7-11 convenience store in Cambridge (across the Charles River from Boston) near the Massachusetts Institute Of Technology, and killed an MIT campus police officer.
Later on, they were caught in the suburb in Watertown (about five-six miles west of Cambridge), where there was a shootout between one of them and police. One suspect is dead, the other one escaped and is still (at this writing, 3:15 P.M. EDT April 19th) at large and leaving large parts of the Boston area under lockdown.
Just after 11 P.M. EDT last night, Dan Rea on WBZ-1030 mentioned the robbery in Cambridge, but based on the tone of the report, it appeared not to be related to the bombings, so I went to sleep just after that.
Like many others in the Boston area (and beyond), I was awakened by an overnight phone call and told what had happened, so I have been watching news coverage.
It's been very difficult for Boston's TV stations, but I think they have done an outstanding job all week.
They will likely win a lot of awards, but this is not the way they wanted their news coverage to be recognized.