On April 15, 2013, two bomb blasts rocked the annual Boston Marathon, injuring more than 170 people and killing three others: Martin Richard, 8; Krystle Campbell, 29; and Lu Lingzu, 23, a Chinese student at Boston University. The suspects later forced a standoff with authorities. They were identified as two ethnic Chechen brothers from southern Russia who had been in the US for about a decade, 19-year-old Dzhokhar Tsarnaev and his 26-year-old brother, Tamerlan, who died in the gun battle. Dzhokhar was arrested on April 19, 2013.