Kenyans living in areas at risk of flooding or landslides will be asked to evacuate on Wednesday, the country's president has said.

William Ruto was speaking in Mai Mahiu, north of Nairobi, where an overflowing reservoir has wiped out a swathe of houses and swept dozens of people to their death.

This is "not a time for guesswork" he said, noting the forecast for more heavy rain.

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