A policeman checks a man during an operation at Vila Cruzeiro slum in Rio de Janeiro November 25, 2010. [Photo/Agencies] 

Policemen stand guard as another officer enters an armored Navy vehicle during an operation at Vila Cruzeiro slum in Rio de Janeiro November 25, 2010. Authorities in Rio de Janeiro struggled to control a fifth day of violence apparently orchestrated by drug gang members who have attacked police stations and burned cars in the Brazilian city. [Photo/Agencies]