Brazilian Navy soldiers patrol in an armoured vehicle during an operation against drug dealers at Mineira slum in Rio de Janeiro February 6, 2011. One month before the carnival celebrations, Rio de Janeiro's security forces started a big operation in the city central area to base peacekeeping units in nine favelas (slums), where about 26,000 people live in. REUTERS/Ricardo Moraes (BRAZIL - Tags: CIVIL UNREST SOCIETY MILITARY)