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Dzhokhar and Tamerlan Tsarnaev set off two pressure cooker bombs during the running of the Boston Marathon, killing three people and injuring 264 others.

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Dzhokhar Tsarnaev
Boston Marathon bomber (born 1993)
Dzhokhar Anzorovich "Jahar" Tsarnaev is an American domestic terrorist and mass murderer of Chechen and Avar descent who, along with his older brother, Tamerlan Tsarnaev, planted pressure cooker bombs near the finish line of the Boston Marathon on April 15, 2013. The bombs…Source: Wikipedia (CC BY-SA)
Tamerlan Tsarnaev
Chechen perpetrator of the 2013 Boston Marathon bombing (1986–2013)
Tamerlan Anzorovich Tsarnaev was a Russian-born terrorist of Chechen and Avar descent who, with his younger brother Dzhokhar Tsarnaev, planted pressure cooker bombs at the Boston Marathon on April 15, 2013. The bombings killed three spectators and injured 264 others.Source: Wikipedia (CC BY-SA)
Boston Marathon bombing
2013 domestic terrorist attack in Boston, Massachusetts, U.S.
The Boston Marathon bombing, sometimes referred to as simply the Boston bombing, was an Islamist domestic terrorist attack that took place during the 117th annual Boston Marathon on April 15, 2013. Brothers Tamerlan and Dzhokhar Tsarnaev planted two homemade pressure cooker…Source: Wikipedia (CC BY-SA)
Pressure cooker bomb
Improvised explosive device
A pressure cooker bomb is an improvised explosive device (IED) created by inserting explosive material into a pressure cooker and attaching a blasting cap into the cover of the cooker.Source: Wikipedia (CC BY-SA)
2013 Boston Marathon
117th edition of the Boston Marathon
The 2013 Boston Marathon was the 117th running of the annual marathon race in Boston, United States, which took place on April 15, 2013. Organized by the Boston Athletic Association (B.A.A.), it hosted the second of the World Marathon Majors to be held in 2013 with over 23,000…Source: Wikipedia (CC BY-SA)