Brazilian student Gustavo Pires Damaceno (R), from Tasso da Silveira school, and his father, Sergeant Adriano Damaceno, leaves a hospital after being treated following a gunman's attack at the school in Rio de Janeiro April 7, 2011. A Brazilian gunman killed 11 children at a Rio de Janeiro school and then himself, police said on Thursday, shocking the South American nation that has never seen such an incident before. REUTERS/Sergio Moraes (BRAZIL - Tags: CIVIL UNREST CRIME LAW)