Officials in Kenya say a dam has burst after heavy rain, causing "huge destruction" and killing at least 10.
The breach happened in the town of Solai, 190km (120 miles) northwest of the capital, Nairobi.
"The water has caused a huge destruction of both life and property. The extent of the damage has yet to be ascertained," said Lee Kinyajui, governor of Nakuru County.
The Kenyan Red Cross says it has rescued 39 people so far.
Hundreds have been left homeless, officials say.