At least nine people have died after a wall surrounding a mosque collapsed, amid heavy rains in the Kenyan capital, Nairobi, according to authorities.
Many people are feared to be trapped beneath the rubble after the wall fell on shanty homes in the Mukuru slum area of the city.
Rescue workers have been looking for survivors.
Several major roads were submerged overnight after heavy downpours.
The owners of the mosque have now been instructed to knock down the remainder of the perimeter wall, Nairobi county deputy commissioner Omar Beja told the BBC.
He said that people who had built their temporary homes along other sections of the wall were frightened of a similar collapse.
Separately, the bodies of two people who were drowned in Nairobi after being swept away in the floods were recovered early on Tuesday, according to police quoted in Kenya's Standard newspaper.
Several parts of Kenya have been hit by flooding after abnormally high rainfall.
In north-eastern Kenya, heavy rains have forced hundreds of families to leave their homes different villages across the region.
In the worst-hit town of Jarajira in north-eastern Garissa county, about 1,000 families had left for higher ground, one local official told the BBC's Bashkas Jugsodhaay in Garissa.
The rains have also affected nomadic communities in the region, with many of them losing their livestock, he says.