American tourist killed in Costa Rica shark attack

San José (AFP) - A 49-year-old US female tourist was killed by a tiger shark this week while diving off a Costa Rican island in the Pacific Ocean, the government and local media reported.The attack also badly injured the 26-year-old male Costa Rican diving guide leading the group that included the American woman.The shark savaged the two on Thursday as they were surfacing after a dive off Coco Island, a pristine national park located 500 kilometers (300 miles) off the Costa Rican mainland