Police hunted Monday for chimpanzees that escaped from a Sierra Leone preserve and mauled a group of American and local sightseers, killing one man and injuring four people. The U.S. Embassy warned Americans against traveling to the Tacugama Chimpanzee Sanctuary, where the chimps escaped before Sunday's attack on a taxicab. The Sierra Leonean driver died as the chimps ripped his body apart, and three Americans were treated at a hospital for minor injuries, said Oliver Somasa, a top police official. Another Sierra Leonean man in the group had his hand amputated after the mauling, Somasa said. U.S. officials had no...