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 ordered businesses, schools and public offices in Karachi to shut on Wednesday after torrential monsoon rain left at least 10 people dead in the densely populated port city, with more heavy downpours predicted.

Anguished Pakistanis are searching remote areas for bodies swept away by weekend flash floods as the death toll has reached 277.