RIO DE JANEIRO – A police helicopter flying over an intense shootout between rival drug gangs in a Rio slum was hit by gunfire Saturday and crashed in a fiery explosion on a football field. Two officers were killed while the pilot and another officer on board suffered burns but managed to escape, a police spokesman said. Bullets flying from the Morro dos Macacos ("Monkey Hill" in Portuguese) slum in northern Rio de Janeiro hit the pilot in the leg as he hovered above the clash, causing him to lose control and crash, turning the helicopter into a blackened wreck.