Boys wade through flooded water after heavy monsoon rain in southern Pakistani port city of Karachi, July 31, 2019. Torrential monsoon rains have played havoc on Pakistan's southern port city of Karachi, killing 20 people and injuring scores of others over the last three days, local media reported on Wednesday. (Str/Xinhua)

Children sit outside their flooded home after heavy monsoon rain in southern Pakistani port city of Karachi, July 31, 2019. Torrential monsoon rains have played havoc on Pakistan's southern port city of Karachi, killing 20 people and injuring scores of others over the last three days, local media reported on Wednesday. (Str/Xinhua)

People remove belongings from their flooded houses after heavy monsoon rain in southern Pakistani port city of Karachi, July 31, 2019. Torrential monsoon rains have played havoc on Pakistan's southern port city of Karachi, killing 20 people and injuring scores of others over the last three days, local media reported on Wednesday. (Str/Xinhua)

Children sit outside their flooded home after heavy monsoon rain in southern Pakistani port city of Karachi, July 31, 2019. Torrential monsoon rains have played havoc on Pakistan's southern port city of Karachi, killing 20 people and injuring scores of others over the last three days, local media reported on Wednesday. (Str/Xinhua)

A woman removes her belongings from her flooded house after heavy monsoon rain in southern Pakistani port city of Karachi, July 31, 2019. Torrential monsoon rains have played havoc on Pakistan's southern port city of Karachi, killing 20 people and injuring scores of others over the last three days, local media reported on Wednesday. (Str/Xinhua)