Iranian President Hassan Rouhani appointed academic Farhad Dejpasand as the new economy and finance minister in a cabinet reshuffle on Sunday, state television reported, as the country faces mounting US sanctions.

Twitter published a trove of some 10 million tweets that it said are potentially the product of state-backed operations by Russia and Iran, shedding new light on the scale and nature of misinformation campaigns mounted by the two nations.

Fourteen Iranian security personnel, including Basij (volunteer forces) and border guards, were abducted by a ‘terrorist group’ on the border with Pakistan on Tuesday, an informed source said.

A twice-stolen ancient Persian artefact is back in Tehran's national museum after a New York court ordered it returned to Iran.

A vessel carrying 2 million barrels of Iranian oil discharged the crude into a bonded storage tank at the port of Dalian in northeast China on Monday, according to Refinitiv Eikon data and a shipping agent with knowledge of the matter.

Iran said it fired missiles on Monday at Islamic State militants in Syria it blames for an attack on its soil on Sept. 22 and said the action shows the government's readiness to punish the "wickedness" of its enemies.

Thousands of people packed the streets of the southwestern Iranian city of Ahvaz on Monday to mourn the victims of an attack on a military parade that killed 25 people, including 12 members of the elite Revolutionary Guards.

"The United States condemns any terrorist attack anywhere, period. We've always stood by that," Nikki Haley, the US ambassador to the United Nations, told CNN.

Iran summoned diplomats from three European countries late Saturday in the wake of a deadly attack on a military parade that it blamed on "a foreign regime."

Gunmen fired on a military parade in southwestern Iran on Saturday, killing 24 people, half of them members of the Revolutionary Guards, state news agencies reported, in one of the worst attacks ever on the elite force.

The United States is seeking to negotiate a treaty with Iran that will cover both its ballistic missile and nuclear programs, US special envoy for Iran Brian Hook said on Wednesday ahead of UN meetings in New York next week.

After negotiations in Sochi on Monday, Russia and Turkey agreed to create a demilitarised zone around the opposition bastion.