Boston Marathon bombing at the finish line

On April 15, 2013, two bombs detonated near the finish line of the Boston Marathon on Boylston Street at Copley Square, killing three people and injuring hundreds of others. The explosions occurred seconds apart near the marathon's end in front of the Boston Public Library and led to a large multi-agency manhunt and investigation. The attack and its aftermath are a major and well-documented event in Boston's sports history.