The floodwaters damaged at least seven villages Saturday in Kabul province, said Syed Ikramuddin Jalali, the head of the Criminal Investigation Department in Shakar Dara security department.
Of the dead were six children, one woman and 15 men, he added.
Afghan police were deployed in the area to assist residents affected by the floods, Jalali said, as reported by Khaama Press.
He said the number of victims could rise as people may be trapped in mud.
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