http://en.wikipedia.org/wiki/2013_Boston_Marathon_bombings
http://bostonglobe.com/metro/2013/04/15/explosions-rock-boston-marathon-finish-line-dozens-injured/yLhfDT1XC3HXSa8wPiVijL/igraphic.html
http://www.infowars.com/boston-marathon-bombing-drill-coincided-with-explosions
http://www.telegraph.co.uk/sport/othersports/athletics/london-marathon/9996484/London-Marathon-2013-security-plans-for-capital-face-review-following-Boston-Marathon-bomb-blasts.html
http://www.guardian.co.uk/world/2013/apr/15/boston-marathon-explosion-live
