Brazil have shut themselves off from the outside world at their pre-World Cup training camp in Curitiba.The players were led out of Curitiba airport through a back door on arrival, avoiding contact with hundreds of waiting fans, and the public will not be able to watch any training sessions.The move follows criticism of Brazil's training camps in Switzerland four years ago when thousands of paying fans watched the team practice in a carnival atmosphere."Obviously, we're not going to let it happen again," said coach Dunga.Source: Reuters