Repression on December 1st, 2012 in Mexico City

On December 1st, 2012, the new President of Mexico, Enrique Pena Nieto, took power. At the same time, hundreds of protesters were outside the National Palace to denounce the corruption that surrounded the victory of the Institutionalized Revolutionary Party (PRI) candidate in the 2012 presidential elections. According to public authorities and the student movement #yosoy132, there were agents provocateurs that gave the police an excuse to repress peaceful protesters and pedestrians that happened to walk in the area. Is this the return of PRI-style state repression?