The death toll in the French territory of Mayotte from Cyclone Chido is “several hundred” and may run into the thousands, the island’s top government official told a local broadcaster Sunday.

The deadliest cyclone in 90 years devastated the French territory, with hundreds feared dead amid a massive rescue operation.

Authorities warned it would take days to know the full death toll, as rescuers and supplies are rushed in by air and sea.