TOPSHOT - People cast their shadows in front of the Chihuahua building during the presentation of an upcoming television series about the 1968 students movement and the Tlatelolco massacre, at the Tlatelolco square in Mexico City on September 25, 2018. - Next October 2 marks the 50th anniversary of the massacre where the armed forces killed hundreds, most of them students. (Photo by ALFREDO ESTRELLA / AFP)