Article Photos: Mexico swears in president amid violent protests 49/54

A demonstrator carrying a Mexican national flag walks past a cloud of tear gas during clashes with police outside the National Congress, just hours before Mexico's new president was to take the oath of office in Mexico City, Saturday, Dec. 1, 2012.  Hundreds of protesters  opposed to newly sworn-in President Enrique Pena Nieto banged on the steel security barriers around Congress, threw rocks, bottle rockets and firecrackers at police and yelled "Mexico without PRI!"  Pena Nieto took power at midnight in a symbolic ceremony and formally took the oath of office Saturday morning in congressional chambers. (AP Photo/Marco Ugarte)