AdvertisementPhotos: Explosions At Boston Marathon FinishApril 15, 2013WBUR NewsroomfacebookEmailPeople assist an injured man after the explosions. (AP Photo/The Daily Free Press, Kenshin Okubo)Justine Franco of Montpelier, Vt., holds up a sign looking for her missing friend, April, who was running in her first Boston Marathon. (AP Photo/Winslow Townson)A marathon runner leaves the course near Copley Square. (AP Photo/Winslow Townson)A man in the crowd following the explosion. (AP Photo/The Daily Free Press, Kenshin Okubo)Firefighters tend to a man at the finish line. (AP Photo/Michael Dwyer)Medical workers aid an injured woman at the finish line. (AP Photo/Charles Krupa)Two police officers with rifles watch from the roof of the Lenox Hotel, overlooking the finish area, following the explosions. (AP Photo/Elise Amendola)Gov. Deval Patrick pauses as he speaks about the explosions during a news conference as Boston Police Commissioner Edward Davis, left, looks on. (AP Photo/Bizuayehu Tesfaye)Members of the Massachusetts National Guard wait for orders on Boston Common in the evening following the explosion. (AP Photo/Michael Dwyer)Emergency responders comfort a woman on a stretcher who was injured in one of the blasts near the finish line. (AP Photo/Jeremy Pavia)The second blast site is investigated and guarded by police. (AP Photo/Elise Amendola)One of the two blast sites on Boylston Street is investigated on Monday. (Elise Amendola/AP)Medical workers aid injured people at the finish line following the explosion. (Charles Krupa/AP)LEFT: Medical workers aid a victim. (Charles Krupa/AP). RIGHT: The scene after the two explosions. (Bruce Mendelsohn/AP)Police clear the area at the finish line as medical workers help the injured. (Charles Krupa/AP)Runners' belongings piled up at the corner of Boylston and Berkeley Streets. (Steve Brown/WBUR)The National Guard gathers on Boston Common. (Steve Brown/WBUR)A Boston police officer patrols the area near the finish line following the explosion. (Josh Reynolds/AP)People react to the explosion at the 2013 Boston Marathon. (The Daily Free Press, Kenshin Okubo/AP)People react to the explosion at the 2013 Boston Marathon. (The Daily Free Press, Kenshin Okubo/AP)Women react as they leave the area of the explosion. (Josh Reynolds/AP)Boylston Street and Berkeley Street in the aftermath of the explosion. (Steve Brown/WBUR)Police seal off the marathon route and move everyone out of the area. (Robin Lubbock/WBUR)Medical workers aid an injured man at the finish line. (Charles Krupa/AP)A Boston police officer clears Boylston Street following the explosion at the finish line. (Charles Krupa/AP)Medical responders run an injured man whose limbs were severely injured. (Charles Krupa/AP)Medical workers wheel the injured across the finish line. (Charles Krupa/AP)Medical workers aid injured people at the finish line. (Charles Krupa/AP)Medical workers aid injured people at the finish line. (Charles Krupa/AP)This program aired on April 15, 2013. The audio for this program is not available.Boston Marathon Bombings