Officials say more than 450 people have died from a three-day heat wave in southern Pakistan, and a state of emergency was declared in hospitals.
The death toll in worst-hit Karachi, where temperatures hit 45 degrees Celsius at the weekend, was at least 450, while another eight to 10 people died in other parts of southern Sindh Province.
The deaths come a month after neighboring India suffered the second-deadliest heat wave in its history, with more than 2,000 deaths.
Semi Jamali, a doctor at Karachi's largest hospital, said they had treated about 3,000 patients suffering from heatstroke.
In Karachi, a city of 20 million people, electricity shortages crippled the water supply system, hampering the pumping of millions of gallons of water to consumers.