By Ivelisse Rivera and Ezequiel Abiu Lopez SAN JUAN, Puerto Rico/SANTO DOMINGO, Dominican Republic (Reuters) -Hurricane Fiona bore down on Turks and Caicos Islands on Tuesday as a powerful Category 3 storm, slamming the Caribbean archipelago with heavy rains and life-threatening flooding after cutting a path of destruction through the Dominican Republic and Puerto Rico. U.S. officials said on Tuesday the storm had claimed four lives in Puerto Rico. A fifth person was killed in Guadeloupe earlier in the week. On Tuesday morning, the storm slammed Grand Turk, the Turks and Caicos’s biggest islan…