A runner's camera, apparently mounted on the forehead, captured the first Boston Marathon explosion as it happened. The 14-second clip, posted to YouTube, shows a view down Boylston Street, heading toward the finish line:

<iframe width="420" height="315" src="http://www.youtube.com/embed/RIHnpHZpFcw" frameborder="0" allowfullscreen></iframe>

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