Latif Khan, a senior disaster management official, said Sunday that most of the deaths from the severe weather overnight were caused by the collapse of mud and stone walls and houses.
He said the heavy rains also caused flash flooding in some places, AP reported.
Another official, Inayatur Rehman, said the roof of a seminary collapsed in the Bajur tribal region, killing six children and injuring nine.
In the cities of Nowshera and Peshawar, motorists were killed and wounded by falling billboards and downed electrical cables
Khan said rescue and relief operations are ongoing, meaning the toll could rise.