file not foundGruesome leg injury captured on video:Aftermath picture (warning: graphic):Raw footage of the 2 explosions:There are multiple reports on Twitter of an explosion at the Boston Marathon.We spoke to a Boston Police Department Spokesperson who said there was "some sort of incident at 671 Boylston Street", which is the finish line for the race.Live video from CBS shows boston.cbslocal.com/2013-boston-marathon-finish-line/ DEVELOPING: The Boston Marathon headquarters has been locked down after two explosions were reported near the finish line, a spokesman told Reuters.Witnesses reportedly heard two booms near the finish line inside the Fairmount Copley Plaza Hotel that sounded like two claps of thunder.The Associated Press says there are reports of injuriesThe pictures below all appear to be from the scene. Some show smoke and the explosion, others appear to show injured people (warning some photos may be upsetting):RT @joshcox: Do not go near the finish line at the #BostonMararthon -- 2 explosions in buildings pic.twitter.com/DNGaLtswYxWhat the fuck just happened? #bostonmarathon pic.twitter.com/Heko9U6r7P