Soldiers on tanks attend to a special operation at the Caju favela in northern Rio de Janeiro, Brazil, on March 3, 2013. A thousand agents of the Civil and Military Police, 200 Navy agents and at least one helicopter took part in the operation to expel drug traffickers from the area, according to the local press. (Xinhua/AGENCIA ESTADO)

Soldiers on tanks attend a special operation at the Caju favela in northern Rio de Janeiro, Brazil, on March 3, 2013. A thousand agents of the Civil and Military Police, 200 Navy agents and at least one helicopter took part in the operation to expel drug traffickers from the area, according to the local press. (Xinhua/AGENCIA ESTADO)

 Soldiers take part in a special operation at the Caju favela in northern Rio de Janeiro, Brazil, on March 3, 2013. A thousand agents of the Civil and Military Police, 200 Navy agents and at least one helicopter took part in the operation to expel drug traffickers from the area, according to the local press. (Xinhua/AGENCIA ESTADO)

Soldiers take part in a special operation at the Caju favela in northern Rio de Janeiro, Brazil, on March 3, 2013. A thousand agents of the Civil and Military Police, 200 Navy agents and at least one helicopter took part in the operation to expel drug traffickers from the area, according to the local press. (Xinhua/AGENCIA ESTADO)