Mahmoud Ahmadinejad has won a crushing victory in Iran’s landmark presidential election, according to the country’s authorities, but his moderate challenger Mir Hossein Mousavi has warned of “tyranny” and protested that the result was rigged after a record turnout of 84%.

As the official results were announced, baton-wielding riot police clashed with angry Mousavi supporters in some of the most serious unrest Tehran has seen in years.

Riot police on motorbikes used batons to disperse Mousavi supporters who staged a sit-in near the interior ministry, where the results were announced. Up to 2,000 Mousavi supporters erected barricades of burning tyres and chanted “Mousavi take back our vote! What happened to our vote?”

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