Sudden floods triggered by heavy rains have killed more than 400 people across parts of Pakistan, India-administered Kashmir and Nepal, authorities have said, with scores of people still missing.

At least 340 people have been killed in flash floods triggered by heavy rains in Pakistan. Reports suggest that the mountainous region of Khyber Pakhtunkhwa has been the most affected.

The country has endured heavier rain during monsoon seasons, which scientists have attributed to climate change. The authorities said that at least 194 people died on Friday.

Entire villages were swept away as torrential rain caused deadly flash floods and landslides in India-controlled Kashmir and northern Pakistan. Dramatic video shows the devastation in the neighboring countries as the death toll is expected to rise.

A provincial emergency service spokesperson says a massive cloudburst triggered flash floods in northwestern Pakistan and has killed at least 157 people, including women and children.

Khyber Pakhtunkhwa government's MI-17 helicopter had taken off from Peshawar for Bajaur when contact was lost over Mohmand tribal district, according to initial reports.

The death toll from heavy rains and flooding in Pakistan has crossed 300, local officials said on Saturday. Hundreds have been killed in recent weeks as Pakistan experienced more rain than usual during the current monsoon season,