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margin-right: 0px; height: auto;" id="media"><br/> <img border="0" height="360" alt="PHOTO: In this photo posted on Twitter by Mike Crockett, runners are seen stopped after two explosions occurred near the end of the Boston Marathon." width="640" itemprop="image" src="http://a.abcnews.com/images/Technology/ht_instagram_twitter_boston_nt_130416_wg.jpg"><br/> <br/> <div class="media_footer_new media_footer_positioned" style="bottom: -1px;" id="media_footer"><br/> <div class="media_footer_container"><br/> <br/> <div class="caption"><br/> <div id="main_cap_short"><br/> In this photo posted on Instagram by Mike Crockett, runners are seen stopped after two explosions occurred near the end of the Boston Marathon. This photo was posted on Twitter, April 15, 2103, by Tyler Wakstein in Boston, with the caption "Was on... <a rel="nofollow" style="font-weight:bold;">View Full Caption</a> <span class="caption_credit">Mike Crockett/Instagram|Tyler Wakstein/Twitter</span><br/> </div><br/> <div style="display:none;" id="main_cap_full">In this photo posted on Instagram by Mike Crockett, runners are seen stopped after two explosions occurred near the end of the Boston Marathon. This photo was posted on Twitter, April 15, 2103, by Tyler Wakstein in Boston, with the caption "Was on second floor of an apartment. Ran down the fire escape of the building. Saw chaos, people crying and screaming. A lot of blood. A lot of people hurt." <a rel="nofollow" style="font-weight:bold;">Close</a> <span class="caption_credit">Mike Crockett/Instagram|Tyler Wakstein/Twitter</span> </div><br/> </div><br/> <br/> <br/> </div><br/> <div class="clearboth"><!-- clear --></div><br/> </div><br/> <br/> <br/> <div class="clearboth"><!-- clear --></div><br/> </div><br/> <script type="text/javascript">videoPhotoCaption = '<br/> \t<div class="\"caption\"">Boston Marathon on Monday</a>, Colby Christopher, 29, saw his Facebook Newsfeed become dominated by news of </p></div></div></div></div></div>