Supporters of defeated Iranian presidential candidate Mir Hossein Mousavi run during riots in Tehran. (GETTY)

A Iranian riot-police officer sprays tear-gas at a supporter of defeated Iranian presidential candidate Mir Hossein Mousavi in Tehran. (GETTY)

Supporters of defeated Iranian presidential candidate Mir Hossein Mousavi help evacuate an injured riot police officer after he was beaten by demonstrators during a protest in Tehran. (GETTY)

A injured supporter of defeated Iranian presidential candidate Mir Hossein Mousavi covers his face during riots in Tehran. (GETTY)

Smoke billows from a burning bus as a supporter of defeated Iranian presidential candidate Mir Hossein Mousavi flashes the victory sign during a protest in Tehran. (GETTY)

A supporter of defeated presidential candidate Mousavi

An Iranian riot-police officer attacks a man with a stick near Tehran's university

Ahmadinejad supporters hurl stones towards supporters of Mousavi just before forcing their way into Tehran University during riots in Tehran

Iranian supporters of President Mahmoud Ahmadinejad force their way into Tehran University, where supporters of defeated Iranian presidential candidate Mir Hossein Mousavi have been leading protests against the election results

Iranian plain clothes policemen beat a demonstrator with batons during a protest against the election results in Tehran on June 14, 2009. (Getty)

Iranian opposition demonstrators carry portraits of defeated reformist presidential candidate Mir Hossein Mousavi, in Tehran on June 15

Hundreds of thousands of Iranian opposition demonstrators fill the squares between Revolution and Freedom (background) in support of defeated reformist presidential candidate Mir Hossein Mousavi, in Tehran on June 15

Iranian opposition demonstrators protest in support of defeated reformist presidential candidate Mir Hossein Mousavi, in Tehran on June 15

Defeated Iranian presidential candidate Mir Hossein Mousavi (C) stands with his wife Zahra Rahnavard (R) outside his office in Tehran on June 15.

Defeated reformist presidential candidate Mir Hossein Mousavi (C) raises his arms as he appears at an opposition demonstration in Tehran on June 15