thumb|right|250px|Memorial stele dedicated to the massacre victims at Tlatelolco.. Enduring questions remained after "La Noche Triste" (the Sad Night) that have taken the Mexican government over 30 years to answer. Eventually in 2001, President Vicente Fox, the president who ended the 70-year reign of the PRI, attempted to resolve the question of who had orchestrated the massacre. President Fox ordered the release of previously classified documents concerning the 1968 massacre.Morning Edition, National Public Radio, April 22, 2002. The documents revealed that Elena Poniatowska's synthesis of the events that October night was accurate, as Kate Doyle uncovered, Thousands of students gathered in the square and, as you say, the government version is that the students opened fire. Well, there's been pretty clear evidence now that there was a unit that was called the Brigada Olímpica, or the Olympic Brigade, that was made up of special forces of the presidential guard, who opened fire from the buildings that surrounded the square, and that that was the thing that provoked the massacre.
thumb|right|250px|Memorial stele dedicated to the massacre victims at Tlatelolco Enduring questions remained after "La Noche Triste" (the Sad Night) that have taken the Mexican government over 30 years to answer Eventually in 2001 President Vicente Fox the president who ended the 70-year reign of the PRI attempted to resolve the question of who had orchestrated the massacre President Fox ordered the release of previously classified documents concerning the 1968 massacreMorning Edition National Public Radio April 22 2002 The documents revealed that Elena Poniatowska's synthesis of the events that October night was accurate as Kate Doyle uncovered Thousands of students gathered in the square and as you say the government version is that the students opened fire Well there's been pretty clear evidence now that there was a unit that was called the Brigada Olímpica or the Olympic Brigade that was made up of special forces of the presidential guard who opened fire from the buildings that surrounded the square and that that was the thing that provoked the massacre