Students and parents leave the Joan Fuster Institute on a bus after a fatal attack at the high school in Barcelona, Spain, on April 20, 2015. (Josep Lago, AFP/Getty Images)
Emergency service workers attend to students near the scene of a deadly attack at a Barcelona high school April 20, 2015. (Josep Lago, AFP/Getty Images)
People gather near the scene of a deadly attack at a high school in Barcelona, Spain, on April 20, 2015. (Josep Lago, AFP/Getty Images)
