2013 Boston Marathon bombing (Copley Square / Boston Public Library)

On April 15, 2013, two pressure‑cooker bombs detonated near the marathon finish line on Boylston Street outside Copley Square, killing three people and injuring hundreds. The three people killed were Krystle Campbell, Lu Lingzi, and 8‑year‑old Martin Richard. Investigations identified brothers Tamerlan and Dzhokhar Tsarnaev as the perpetrators; Tamerlan died in a shootout with police and Dzhokhar was later convicted on federal charges. The explosions occurred adjacent to the Boston Public Library and other landmarks in Copley Square.