Reports from Russia's North Caucasus region of Daghestan say a mudslide caused by torrential rains has killed six people in the city of Derbent.
Officials said heavy rain that lasted for up to 45 minutes also flooded more than 300 houses in the city, where 1,200 residents, including 280 children, were trapped for several hours.
Rescue operations and streets cleaning were under way.
In August, a flash flood killed 171 people in the town of Krymsk in the North Caucasus region of Krasnodar Krai.
Several local officials were later fired as local citizens complained they had had no warning of the danger.
Based on reporting by Reuters and Interfax