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More than three-quarters of the people in Mayotte live below the French poverty line. Tensions were stoked earlier this year by a water shortage.

An air bridge was being put in place from Reunion Island, another French overseas territory on the other side of Madagascar, the government said.

The disaster is the first challenge faced by Prime Minister Francois Bayrou, days after President Emmanuel Macron appointed him following the collapse of the previous government.

The cyclone went on to hit northern Mozambique on Sunday, but the full extent of the impact was not clear.

In Comoros, two people were slightly injured, 24 displaced, and 21 homes were destroyed, authorities said.

France colonised Mayotte in 1843 and annexed the whole archipelago, including Comoros, in 1904.

In a 1974 referendum, 95 percent backed separation but 63 percent on Mayotte voted to stay French. Grande Comore, Anjouan and Moheli declared independence in 1975. Mayotte is still ruled from Paris.