A police officer aims a machine gun at a woman as people protest beside a body killed during a shootout involving police and suspected drug traffickers at the Complexo de Alemao slum in Rio de Janeiro, Tuesday, Feb. 13, 2007. The violence comes just before the city’s Carnival celebrations next Feb 18 and Feb 19. Rio is one of the most violent cities in the world with an annual homicide rate of about 50 per 100,000. (AP Photo/Ricardo Moraes)