Pakistan’s financial capital of Karachi is wilting in a four-day heat wave that has killed more than 780 people, a health charity said on Wednesday, as the government declared a holiday in the city to encourage people to stay home and cool off.

The heat wave has coincided with severe electricity cuts and the holy month of Ramadan, when most Muslims fast during daylight hours. Many of the deaths were caused by dehydration. Temperatures reached 44 degrees Celsius over the weekend.

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