France rushed rescue workers and supplies to its Indian Ocean territory of Mayotte on Monday after the island group was battered by its worst cyclone in nearly a century.

Officials on the island off the eastern coast of Africa said the number of people killed by Tropical Cyclone Chido could be much higher than the 14 now confirmed dead.

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