text:  In 1968, thousands of students took to the streets in Mexico City ten days before the Olympics there. It resulted in Mexican government security forces opening fire on the demonstrators. In 2011, one of the young protesters, David Huerta, spoke to Julian Miglierini. It's October 1968. Ten days before the Olympic Games, students are demonstrating in Tlatelolco Square in Mexico City. Suddenly, gunfire erupts.