Tehran's Stock Exchange was shut down on February 28 shortly after Israeli strikes on the capital began, having opened the session with a gain of more than 30,000 points before trading was suspended.
The halt came within minutes of the first explosions being heard across Tehran, as Israeli and US forces struck multiple cities including the capital, Isfahan and Qom. Israeli Defence Minister Israel Katz described the operation as pre-emptive, confirming that strikes against Iran had begun.
Iran's Civil Aviation Organisation closed the country's entire airspace until further notice, while mobile phone services were cut across Tehran.
The rial simultaneously plunged to a record low of IRR1,749,500 against the dollar on the free market, according to Bonbast data, as panic spread through financial markets.
Authorities have released no casualty figures. Iranian officials denied social media reports that President Masoud Pezeshkian had been killed, with a senior official telling Shafaqna the claims were false.
This story is developing.