During the protests of 1968, Mexican government killed an estimated 30 to 300 students and civilian protesters. This killing is known as in the Tlatelolco massacre. killing of an estimated 30 to 300 students and civilians by military and police on October 2, 1968, in the Plaza de las Tres Culturas in the Tlatelolco section of Mexico City. The events are considered part of the Mexican Dirty War, when the government used its forces to suppress political opposition. The massacre occurred 10 days before the opening of the 1968 Summer Olympics in Mexico City.