PHOTOS: Boston Marathon explosions

<div class="meta image-caption"><div class="origin-logo origin-image "><span></span></div><span class="caption-text">An unidentified Boston Marathon runner leaves the course crying near Copley Square following an explosion in Boston Monday, April 15, 2013. &#40;AP Photo&#47;Winslow Townson&#41;</span></div>
April 16, 2013 9:04:43 AM PDT