A massive deluge in Pakistan's southern city of Karachi has forced the government to deploy troops there to help drain the flood waters. 
Prime Minister Shahid Khaqan Abbasi ordered Pakistani troops and paramilitary rangers to offer assistance and machinery to civilian rescue agencies to help pump water out of the city and end the deluge, the office of Karachi Mayor Wasim Akhtar said.
Catastrophic flooding has hit India, Nepal, Bangladesh and Pakistan during the worst monsoon season to hit South Asia in more than a decade.
The monsoon rains that began in June have unleashed flooding and landslides that killed more than 1,700 people and affected at least 41mn others, according to the United Nations.
In Karachi, the death toll climbed to 27 after at least 15 people, including children, died overnight into Friday due to electrocution, falling buildings and inundation, Akhtar said.
Thousands of residents in two Karachi neighbourhoods were being told to evacuate due to fears that they could be swept away by a river, Akhtar added.
The death toll in Karachi could rise after rescuers reach all people trapped in currently unapproachable areas, said Anwar Kazmi, spokesman of Edhi rescue agency.
The metrological department predicted more rain but at a lower intensity.
Heavy rains have also hit the central province of Punjab, where the National Disaster Management Authority (NDMA) warned of a similar deluge.
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