premise: Tamerlan Tsarnaev has been to Boston.
hypothesis: Tamerlan Tsarnaev . was a terrorist who , with his brother Dzhokhar Tsarnaev , planted bombs at the Boston Marathon on April 15 , 2013 . He came to the United States in 2004 . Shortly after the Federal Bureau of Investigation declared them suspects in the bombings and released images of them , the Tsarnaev brothers killed an MIT policeman , carjacked an SUV , and engaged in a shootout with the police in the Boston suburb of Watertown . ABC reported on April 23 , 2013 , that authorities linked Tsarnaev to an unsolved triple homicide in nearby Waltham that took place around the 10th anniversary of the September 11 attacks .