As temperatures rise in South Pakistan, so does the death toll.
According to the Edhi Ambulance Service, around 30-40 people are usually transported to the Karachi City Mortuary every day.
But in the past six days, it has collected around 568 bodies - 141 of them on Tuesday alone.
It is too early to determine the exact cause of death in each case.
However, the rising death toll came as temperatures in Karachi soared above 40C and high humidity made them even hotter to 49C, reports said.
People are heading to hospitals in search of help.
Karachi Civil Hospital admitted 267 people with heatstroke between Sunday and Wednesday, said Dr Imran Sarwar Sheikh, head of the emergency department. Twelve of them have died.
"Most of the people we saw coming to the hospital were in their 60s or 70s, although there were some in their 45s and even a few in their 20s," Dr Sheikh told the BBC.
Symptoms include vomiting, diarrhea and high fever.
"Many of those we saw were working outside. We told them to make sure they drank plenty of water and wore light clothing in these high temperatures."
The high temperatures - described by one meteorologist as a "partial heatwave" - began at the weekend last week.
Heat relief centers and camps were set up to provide relief to the population.
Pictures show children playing in fountains to cool off.
Not all those in need of help manage to get hospital care. | BGNES
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