Graphic video: First moments after Boston Marathon blasts
Boston Marathon Explosion: Second Bomb Blast
Boston Suspects' Uncle: They Were 'Losers'
Boston Marathon Bombers | Why They Did It
Two homemade bombs detonated near the finish line of the Boston Marathon, creating a scene of chaos and killing three visitors and wounding more than 260 other people. Terrorists were two Muslim bothers born in the former Soviet republic of Kyrgyzstan. One of them was killed shortly after accident.