News that Iran's President Mahmoud Ahmadinejad has been re-elected has sparked angry clashes on the streets of Tehran.
It is the worst violence the city has seen in a decade.
Supporters of Mir Hossein Mousavi say he was cheated of victory and have taken their anger out on some police motorbikes.
The police responded by using batons and tear gas to disperse the protesters.
The police used motorbikes to catch up with the protesters, before doing whatever they could do disable them.
But amidst all the vitriol, there was some compassion - this opposition supporter helped evacuate an injured police officer from the angry crowds.
Some of Mr Mousavi's supporters hoped he would relax some of the strict controls on what Iranians are allowed to wear, if he had won the election.
Earlier, Mr Ahmadinejad's supporters had been out on the streets to cheer his win.
Away from the capital, in the holy city of Qom the president's supporters were in the mood to celebrate.
One day after the election, traces of the campaign were already being painted over near Mr Mousavi's Tehran campaign headquarters.
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