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Explosion at Boston Marathon Finish

Alexander Abad-Santos
Explosion at Boston Marathon Finish

Reuters is reporting that the headquarters at the Boston Marathon have been locked down after an explosion was reported near the finish line Monday afternoon. Here's a Twitter image of the current scene there:

Just heard that bombs went off at #boston marathon finish line twitter.com/chanyasulkit/s…

— Chris Chanyasulkit (@chanyasulkit) April 15, 2013

This is a developing story, and we'll have more as news and details come in.