Flash floods triggered by cloudbursts in the mountainous northwest have brought destruction since Friday in the worst spell of this year's monsoon.

A sudden cloudburst triggered devastating flash floods in Buner, Pakistan, killing at least 20 and leaving villages in ruins. Survivors described the scene as “apocalyptic” while rescue teams retrieved 18 bodies and searched for the missing amid warnings of more rain.

Rescuers and residents resumed searching on Tuesday for survivors as the death toll from five days of torrential rain rose to almost 400, with authorities warning monsoon downpours would continue until the weekend.

Pakistan has received higher-than-normal monsoon rainfall this year, triggering floods and mudslides that have killed more than 540 people since June 26.

Severe monsoonal flooding has caused widespread devastation across Pakistan, destroying homes and sweeping away entire villages.

According to details surfaced on Thursday, PM Starmer expressed grief over the losses of lives due to the flash floods in Pakistan's northern areas.

Pakistan declared a public holiday in Karachi as the financial capital braced for more rain on Wednesday, after the arrival of the annual monsoon season left at least seven people dead and caused widespread flooding,

Pakistan has been grappling with widespread torrential rains in almost all parts of the country that have wreaked havoc and left over 700 people dead and hundreds injured. The deluge crippled the already dilapidated infrastructure, damaging houses, roads, and commercial centres.