Video of the explosion (very poor quality) - http://deadspin.com/heres-video-of-the-moment-the-boston-marathon-bombs-ex-473015503 http://deadspin.com/heres-vide

Video of the explosion (very poor quality) - http://deadspin.com/heres-video-of-the-moment-the-boston-marathon-bombs-ex-473015503 http://deadspin.com/heres-video-of-the-moment-the-boston-mar...