Fifty years ago Tuesday, Mexican troops opened fire on student demonstrators, killing hundreds just days before Mexico City hosted the 1968 Olympics -- one of the darkest episodes in a year of global turbulence.
But five decades on, the October 2 massacre is little-remembered by the rest of the world and is shrouded in mystery in Mexico, where no one has ever been punished.
Today, it remains unclear exactly what happened, and how many people were killed.
Felix Hernandez, one of the leaders of the student movement that had gathered thousands of people that night at a . . .
