Torrential monsoon rains are feared to have killed another 33 people across Pakistan Tuesday, including 20 when a bus slid off a flooded mountain road and plunged into a ravine.

Ten bodies have been recovered after Tuesday's bus accident in Swat, a scenic mountain region in northwest Pakistan, and another 10 are still missing, local official Jamal Khan said.

Another five people were killed in Pakistani Kashmir when a landslide sheared off a mountainside left unstable by last October's South Asia earthquake.

"A woman, her daughter aged three and three sons died when a huge boulder fell on their home" near the town of Balabandi, local police chief Zahoorul Hassan told AFP.

The United Nations warned last week that landslips and floods could displace thousands of people already in temporary shelters after October's quake, which killed 73,000 people.

Flash floods swamped several villages in rugged southwest Pakistan on Monday, said Baluchistan province's government spokesman Shakeel Ahmed.

One woman died when the roof of her house collapsed near the town of Sibi and seven others were missing after they were swept away by overflowing rivers, Ahmed said.

Hundreds of people were being evacuated to safer places.

Incidents blamed on the annual monsoon rains have claimed more than 170 lives in Pakistan in the past two weeks.

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