On April 15th, 2013, runners in Boston were approaching the finish line of the city's esteemed marathon at ten minutes to three in the afternoon when a large explosion tore through the crowd. Thirteen seconds later, a second one went off down the street. The manhunt for the men who committed the attack would last several days and take over the entire metropolitan area. Videos: The Days That Shaped America: Boston Bombing Nova - Manhunt Boston Bombers Boston Marathon Documentary - Amazing History & Injustices Discovery+: What Really Happened, the Boston Marathon bombing, parts one and two Articles and books: Criminal complaint against the surviving Boston bomber MIT News: "He loved us, and we loved him." Boston Bomb Victim in Photo Helped Identify Suspects Cambridge Man Indicted for Making False Statements in the Boston Marathon Bombing Terrorism Investigation Here's what various parts of the Boston Marathon bombing memorial represent Boston Strong: A City’s Triumph Over Tragedy, by Casey Sherman and Dave Wedge Officer Dennis Simmonds: 5 things to know about the Boston bombing's 5th victim Boston suspects [Update]: ‘Very normal,’ yet struggling to fit in Robel Phillipos sentenced to three years in prison Family says goodbye to youngest blast victim Timeline of Boston Marathon Bombing Events