Heavy monsoon rains triggered floods and landslides in India’s Himalayan region, leaving at least 33 people dead and many others trapped, officials said on Monday.

Torrential downpours that began over the weekend in mountainous Himachal Pradesh state have flooded roads and washed away homes as scores of rescuers work to help those trapped under piles of debris.

A cloudburst in the state’s Solan district on Sunday night killed nine people in the area, and 12 people died following two landslides in Shimla, the state’s capital, authorities told the Press Trust of India news agency.

Four others were killed in heavy rain and a landslide in the state’s Hamirpur district, they added.

India Monsoon Rains
Authorities said the death toll could rise as they work to pull out those still trapped after the landslides (Pradeep Kumar/AP)

The state’s chief minister, Sukhvinder Singh Sukhu, said rescuers in Shimla were working to clear the debris and help those still trapped.

Cloudbursts are a common occurrence in Himalayan regions, but experts say they are alarmed by the increase in extreme weather-related events in the area.

Cloudbursts occur when more than 3.94in (10cm) of rainfall occurs within 3.86 square miles (10 sq km) within an hour. They have the potential to cause intense flooding and landslides and can affect thousands of people in India’s mountainous regions.

Homes in Solan were washed away and roads flooded in the incessant rains, police officials told the Press Trust of India news agency.

India Monsoon Rains
Rescuers search for people feared trapped after a landslide near a temple on the outskirts of Shimla (Pradeep Kumar/AP)

In Shimla, the landslides occurred near a Hindu temple, and authorities said the death toll could rise as they work to pull out those who are still trapped.

All schools and colleges in the state have been shut and more than 700 roads, inundated with water, have been closed.

India’s weather department warned that more moderate to heavy rain will hit various parts of the state on Monday.

It had issued a red alert over the weekend for intense downpours in neighbouring Uttarakhand state, where 60 people have died in the monsoon rains this season, news agency PTI reported.

India Monsoon Rains
Rescuers remove mud and debris as they search for potential victims (Pradeep Kumar/AP)

In July, record monsoon showers killed more than 100 people over two weeks in parts of northern India, including in Himachal Pradesh, which was the worst hit.

Disasters caused by landslides and floods are common in India’s Himalayan north during the June-September monsoon season. Scientists say they are becoming more frequent as global warming contributes to the melting of glaciers there.

Last year, flash floods killed nearly 200 people and washed away houses in Uttarakhand.