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