Iranian state TV says flash floods triggered by heavy rains have killed 10 people in the capital, Tehran, and southern regions.
The report on September 19 said the flash flood killed six in Tehran and four in the southern province of Hormozgan a day earlier.
At least eight people, including five members of the same family in Tehran, were still missing. Relief and rescue operations are under way.
Earlier in July, at least 11 people were killed in flash flooding in both Tehran and the northern province of Alborz.
Authorities attribute the rising number of deadly flash floods to deforestation and improper construction near riverbeds.