article_snippet.sent: famous marathon in 2013, killing three people and injuring 264 .
article_snippet.sent: marathon takes place.
article_snippet.sent: At Massachusetts Emergency Management Agency (MEMA) headquarters in Framingham, Mass., director Kurt Scwartz, at podium, talks with media about public safety planning for the 2015 Boston Marathon . '
article_snippet.sent: The famed race, which draws elite runners from around the . world, takes place on the Patriots Day holiday in Massachusetts .
article_snippet.sent: - commemorating the first battles of the American Revolution - . and has taken on special significance for Massachusetts's residents .
article_snippet.sent: In this April 21, 2014 file photo, a Boston Police K-9 officer and Dzhokhar dog patrol with a National Guardsman, rear right, along Commonwealth Avenue near the finish line of the 118th Boston Marathon .
article_snippet.sent: In this April 21, 2014 file photo, a Boston Police K-9 officer and his dog patrol with a National Guardsman, rear right, along Commonwealth Avenue near the finish line of the 118th Boston Marathon, a Boston Police officer stands near the finish line as runners approach during the 118th Boston Marathon in Boston .