Pakistan is suffering its "most devastating monsoon season ever" said its foreign minister, with a 1,000 people killed and more than 30 million people forced to leave their homes.

Images have shown flash flooding in the northern province of Khyber Pakhtunkhwa causing the Kabul River to swell, and sweeping away a large bridge that has cut off some districts from road access.

Bilawal Bhutto Zardari has said that the levels of rainfall have "smashed all records" and with resources stretched to the limit, Pakistan is appealing to other United Nation countries for assistance.

"This has been the most devastating monsoon season ever on record. Whether it is our own records, ever since we've been Pakistan or if you go back to British colonial times," the foreign minister told CGTN.

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"We've smashed all records of monsoon rains. The level of devastation of these floods is very difficult to communicate and comprehend just because of their scale. (...) Our last, the highest floods before this were in 2010 and in 2011, and what we called at the time, super floods. 

"But the way in which those floods are different to last time (...) they either affected one side, the left bank of the river or the right bank of the river. They were limited to those specific areas. They were devastated but this time around, just my province of Sindh, the entire province has been inundated by floods that came relentlessly from the skies."

Mr Bhutto Zardari told how millions of people have been displaced as well as the horrendous death toll.

"So far, we've had more than a thousand people who've been killed in these floods. We have 33 million households displaced," he said. 

"The devastation to crops and the rural agricultural economy is about 80 to 90 percent of our crops have been destroyed, and the scale of the disaster, the extent to which it has affected so many different areas, has really stretched our resources, our capacity – the demand for relief is far outstripping our supply."

Pakistan is now appealing for international aid to help it deal with the catastrophe.

Mr Bhutto Zardari said: "Our UN appeal will be launched on Tuesday, which will officially reach out to all United Nations countries for assistance. In the meantime, many countries have already bilaterally reached out for assistance and aid."