On April 15, 2013, two homemade bombs detonated 12 seconds and 210 yards 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.
The Boston Marathon is an annual marathon hosted by several cities in greater Boston in eastern Massachusetts, United States.
Boston is the capital and most populous city of the Commonwealth of Massachusetts in the United States.
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On April 18 the Federal Bureau of Investigation released images of two suspects, who were almost immediately identified as Chechen-American brothers Dzhokhar Tsarnaev and Tamerlan Tsarnaev.
Dzhokhar Anzorovich "Jahar" Tsarnaev is an American citizen born in Kyrgyzstan who was convicted of planting bombs at the Boston Marathon on April 15, 2013, together with his brother Tamerlan Tsarnaev.
The Federal Bureau of Investigation, or FBI, is the domestic intelligence and security service of the United States, which simultaneously serves as the nation's prime federal law enforcement agency.
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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.
The Massachusetts Institute of Technology is a private research university in Cambridge, Massachusetts, often cited as one of the world's most prestigious universities.
A shootout, also called a firefight or gunfight, is a gun battle between armed groups.
Tamerlan Tsarnaev was shot several times, and his brother ran him over while escaping in the stolen car; he died soon after.
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 by police while still in the boat and then arrested.
During questioning, Dzhokhar alleged that he and his brother were motivated by extremist Islamist beliefs and the wars in Iraq and Afghanistan, that they were self-radicalized and unconnected to any outside terrorist groups, and that he was following his brother's lead.
He said they learned to build explosive devices from an online magazine of the al-Qaeda affiliate in Yemen.
Al-Qaeda is a militant Sunni Islamist multi-national organization founded in 1988 by Osama bin Laden, Abdullah Azzam, and several other Arab volunteers who fought against the Soviet invasion of Afghanistan in the 1980s.
Yemen, officially known as the Republic of Yemen, is an Arab country in Western Asia, occupying South Arabia, the southern end of the Arabian Peninsula.
He also said they had intended to travel to New York City to bomb Times Square.
Times Square is a major commercial intersection and neighborhood in Midtown Manhattan, New York City, at the junction of Broadway and Seventh Avenue, and stretching from West 42nd to West 47th Streets.
The City of New York, often called New York City, New York, or simply The City, is the most populous city in the United States.
On April 8, 2015 he was convicted of thirty charges, including use of a weapon of mass destruction and malicious destruction of property resulting in death.
A weapon of mass destruction is a nuclear, radiological, chemical, biological or other weapon that can kill and bring significant harm to a large number of humans or cause great damage to human-made structures, natural structures, or the biosphere.
The following month he was sentenced to death.