The vote was declared in Dr Pezeshkian's favour after he secured 53.3% of the more than 30 million votes counted. Mr Jalili polled at 44.3%.

The run-off came after no candidate secured a majority in the first round of the election on 28 June, which saw a historically low voter turnout of 40%.

The election was called after Iran’s previous president Ebrahim Raisi was killed in a helicopter crash in May, in which seven others also died.

The leaders of China, India and Russia have all congratulated Dr Pezeshkian on his victory.

Even before the final results were declared by Iran's interior ministry, Dr Pezeshkian's supporters had taken to the streets in Tehran and a number of other cities to celebrate.