In the FBI video of the suspects, they turn left onto Boylston street at a corner. Which crossstreet is it?
Here's the video and you can see them walk from the cross street and turn left onto Boylston around 0:24 to 0:30.
http://www.youtube.com/watch?v=M80DXI932OE
There's a wooden telephone pole on that corner (far right of video). I don't think that's Fairfield, which is the street that in David Green's post-bomb photo shows white-hat suspect turning down. Which cross street is in the video?
I'm sure the FBI is considering where did they come from beforehand and where did they go afterward. The T? Car? Walk from an apartment or hotel? Take a cab?
Looks like in both David Green's post-bomb photo and the FBI video that they came from and went afterwards *north* of Boylston St. But who knows where. Of course, during the race, you can't cross Boylston at that point. But after the bomb, everyone is fleeing in all kinds of directions even in the race route, but white-hat suspect turns north on Fairfield.