A huge sandstorm and record winds has killed at least four people in Tehran, plunging Iran's capital into darkness during rush hour and forcing thousands to run for cover.
The freak weather struck at 5.10pm local time, knocking down trees and sweeping debris across streets and into the windscreens of cars.
State media reported 70-mile per hour winds at the peak of the disruption.
Power supplies were knocked out in at least 50,000 homes, an electricity official said, and the weather smashed windows and caused telecommunication towers to topple and masonry to fall off buildings.
Forecasters initially warned Tehranis to stay indoors, shortly before the ISNA news agency said the fatalities had been caused by falling trees.
Almost 7,000 emergency workers were deployed within the hour, city officials said, and Ahad Vazifeh, in charge of government weather forecasts, cautioned of more bad weather lasting into Wednesday.
After a 15-minute blackout caused by the initial force of the sandstorm hit, rains arrived with winds remaining strong.
Pictures posted on social media showed a gigantic sand cloud filling the city's skyline, before it turned dark and outside temperatures plunged from 33C to 18C.
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