FBI agents Thursday joined an Indonesian investigation into the killing last August of two American schoolteachers in the restive province of Papua. The move follows Jakarta’s failure to charge anyone over the attack. A U.S. official said last week a proper resolution of the case would help ties between the United States and Indonesia, the world’s most populous Muslim nation. One Indonesian was also killed when gunmen ambushed a convoy of mainly American schoolteachers and their families near a giant U.S.-owned copper and gold mine. Full Story