Tens of thousands of people are still without access to water in Mayotte after the French Indian Ocean territory was devastated by Cyclone Chido, as rescuers race to find missing people.
Preliminary figures from France's interior ministry report 22 people have died, but Mayotte's prefect has warned the toll could rise to thousands.
Health workers are concerned infectious diseases could spread, as residents have reported clean drinking water shortages and shops are rationing supplies. More aid is due to arrive on Wednesday.
Islanders spent a first night under curfew between 22:00 local time on Tuesday and 04:00 on Wednesday (19:00 and 01:00 GMT) as part of measures to prevent looting.