http://i.imgur.com/SavlyU2.jpg
Follow link, look near the bottom of the photo compilation, mentioned by research99.
Follow the red arrows, and you’ll see WHITE BASEBALL CAP walk away from BLUE TRACKSUIT (who stands there waiting for him as WHITE CAP walks into the thick crowd near the barrier/curb towards the street barrier).
Is that where one of the bombs detonated “closer to the street?”
Check out this photo analysis.
“Baby stroller” at Marathon appears to contain pressure cooker almost identical to one shown in al-Qaeda bomb-building instruction manual at their journal “Inspire.”
http://www.freerepublic.com/focus/news/3009313/posts?page=59#59