A youth sits on the sand near a cross placed by demonstrators protesting the trafficking of weapons and ammunition as a tribute to the victims at Tasso da Silveira school where a gunman shot and killed 12 children, on Copacabana Beach in Rio de Janeiro, Brazil, Sunday April 10, 2011. Ten girls and two boys between the ages of 12 and 15 were killed on Thursday by 23-year-old Wellington Oliveira, who shot and killed himself after being confronted by police. (AP Photo/Felipe Dana)