People wear skull masks during a protest in Ciudad Juarez December 6, 2009. Thousands of people demanded soldiers leave Mexico's most violent city on Sunday, accusing troops of provoking a surge in drug war killings and running protection rackets. Around 5,000 people marched through Ciudad Juarez on the U.S. border, many with white balloons and signs reading "Leave Juarez soldiers and federal police," angry at the army's failure to stop drug-related murders in the city. REUTERS/Alejandro Bringas (MEXICO CONFLICT MILITARY CRIME LAW)