Yesterday's huge sandstorm and record winds plunged Tehran into darkness for 15 minutes during rush hour and forced thousands to run for cover.
"One of the casualties, who was hospitalised after being hit by debris, lost his life due to the severe injuries," the official IRNA news agency reported today, raising the death toll to five.
The winds, as high as 110-120 kilometres per hour, levelled trees and swept other heavy material across streets and into the windscreens of cars as people headed home from work.
The surprise weather disrupted a ceremony for the national football team before they depart for the World Cup in Brazil, with President Hassan Rouhani cancelling his planned speech, leaving a 12,000-seat stadium largely empty.
Ahad Vazifeh, head of Tehran's weather forecasting and warnings unit, said his team had informed "relevant authorities" about the sandstorm. However, he said the timescale and wind speeds were not completely predictable.
But Mohammad Ali Aziz-Oghli, the city's chief forecaster, warned of another sandstorm hitting Tehran at about 0400 IST, albeit not of the same strength. People should stay indoors, he told IRNA.
Power supplies were knocked out in at least 50,000 homes yesterday, an electricity official said. The weather also smashed windows and caused telecommunication towers to topple and masonry to peel off buildings.
