Mexico swears in president amid violent protests - Article Photos 1/54

The street where Mexico's Congress is located is shown blocked by a metal barricade in Mexico City, Monday, Nov. 26, 2012. Police heightened security around the building where Mexico's President-elect Enrique Pena Nieto, of the Institutional Revolutionary Party (PRI) will be sworn-in on Dec. 1. (AP Photo/Eduardo Verdugo)