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A concrete UN sign that used to stand over the camp's now impassable main entrance has been knocked down.

"Whiteout conditions will make travel extremely hazardous, with impassable roads and a high risk of motorists becoming stranded," the NWS warned.

In Mayotte, widespread damage to infrastructure - with downed power lines and impassable roads - is severely hindering emergency operations.

Many roads on the island are impassable, while bridges have collapsed in the Kallithea-Faliraki area.

Reaching anything needing attention can take days or even weeks because the lines that carry water to customers meander through valleys, over ridgelines, and along roadways, many of which remain impassable.