Sudden floods triggered by heavy rains have killed more than 200 people across parts of Pakistan, India-administered Kashmir and Nepal, authorities have said, as scores of people remain missing.

According to the National Disaster Agency, the intensity of this year's monsoon is about 50% to 60% higher than last year.

Cloudbursts are causing chaos in mountainous parts of India and Pakistan, with tremendous amounts of rain falling in a short period of time over a concentrated area

Rescuers struggled to retrieve bodies from muddy debris on Saturday after flash floods triggered by heavy monsoon rains across northern Pakistan killed at least 344 people in the past 48 hours, authorities said.

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.