Boston Marathon bombings
During the Boston Marathon on April 15, 2013, two pressure cooker bombs exploded killing three people and injuring hundreds. A few days later, suspect Dzhokhar Tsarnaev was killed in a police shootout and his brother, Tamerlan, was captured.
April 15, 2013: Two explosions injure scores of people, some fatally, toward the end of the Boston Marathon.
A unique look at how the story developed on social media.
World Series MVP David Ortiz and Boston Red Sox teammate Shane Victorino had their beards shaved for charity Monday to benefit victims of the Boston Marathon bombings in April.
Mery Daniel, a Boston Marathon bombing survivor, works to recover from her injuries.
Chicago Marathon runners hit the streets Sunday morning, nearly six months after the Boston Marathon bombings, with more security lining race route and spectator areas.