The death toll from Cyclone Chido's rampage through the French overseas territory of Mayotte remained unclear on Wednesday, with shantytowns that were home to undocumented migrants flattened and many areas still inaccessible.

France is rushing help by ship and military aircraft to its poor overseas territory of Mayotte in the Indian Ocean that has been shattered by its worst storm in nearly a century.

Local authorities said the cyclone, which made landfall with 140 mph, winds devastated several “shantytowns” across the island.