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.

ISLAMABAD (Reuters) -Nearly 200 people were killed in torrential rains in northwest Pakistan over the past 24 hours, with bad weather also bringing down a rescue helicopter, local officials said on Friday.

By Sunday morning, the death toll from the rains across the mountainous north of Pakistan had risen to at least 337 people, with most killed in flash floods, according to the National Disaster Management Authority. In Buner, a three-and-a-half-hour drive from the capital Islamabad, 207 lives were lost and others are still missing.