<Tr> <Th> Motive </Th> <Td> Terrorism </Td> </Tr> <P> On April 15, 2013, two homemade bombs detonated 12 seconds and 210 yards (190 m) apart at 2: 49 p.m., near the finish line of the annual Boston Marathon, killing three people and injuring several hundred others, including 16 who lost limbs . </P> <P> On April 18 the Federal Bureau of Investigation (FBI) released images of two suspects, who were later identified as Kyrgyz - American brothers Dzhokhar Tsarnaev and Tamerlan Tsarnaev . The brothers killed an MIT policeman, kidnapped a man in his car, and had a shootout with the police in nearby Watertown, during which two officers were severely injured, one of whom died a year later . Tamerlan Tsarnaev was shot several times, and his brother ran him over while escaping in the stolen car; Tamerlan died soon after . </P> <P> An unprecedented manhunt for Dzhokhar Tsarnaev ensued on April 19, with thousands of law enforcement officers searching a 20 - block area of Watertown; residents of Watertown and surrounding communities were asked to stay indoors, and the transportation system and most businesses and public places closed . Around 6: 00 p.m., a Watertown resident discovered Dzhokhar hiding in a boat in his backyard . He was shot and wounded by police before being taken into custody . </P>

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