Tlatelolco massacre

From Wikipedia

The Tlatelolco Massacre, also known as The Night of Tlatelolco (from a book title by the Mexican writer Elena Poniatowska), took place during the afternoon and night of October 2, 1968, in the Plaza de las Tres Culturas in the Tlatelolco section of Mexico City. It happened ten days before the 1968 Summer Olympics celebrations in Mexico City, when the military and armed men shot student demonstrators. The death toll remains controversial: official government estimates place the deathtoll at 30, while some estimates place it in the thousands. Most sources, however, report between 200 and 300 deaths. The exact number of people arrested is also controversia.