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For those interested in something very up to date, here’s someone transcribing the police scanner on Reddit.
And here’s another such Reddit scanner transcription that’s still ongoing as of 12:45 a.m. That thread continues here after 1 a.m. Pacific.
Here’s a Google map showing unfolding events overnight in (so far as I can tell) chronological order.
This Boston TV site seems to be highly respected among people following the story tonight as a live news aggregator.
Black cap bomber dead, with suicide IED detonating on his chest after he’s shot.
4:00 a.m.: White cap bomber on the run, possibly holed up in a building. Identified as Dzhokhar A. Tsarnaev, age 19, younger brother of the black cap bomber. They’re from Russian area near Chechnya, in U.S. for >1 year as lawful permanent residents.
Black cap has been identified as his older brother Tamerlan Tsarnaev, 26, subject of this fascinating post in Slate.