Tens of thousands of Iranian demonstrators have defied a warning by the authorities not to turn an annual pro-Palestinian rally into street protests against Mahmoud Ahmadinejad. Clashes involving protesters, security forces and Ahmadinejad supporters have broken out. [Post updated throughout the day]

Amir (not his real name) is a student in Tehran. He is taking part in the opposition rally.

Tens of thousands of supporters of [opposition leader] Mirhossein Mousavi are marching in the streets. There have been clashes between opposition members and Ahmadinejad supporters, who are backed by the Basij [a pro-government militia]. The police stepped in, but Ahmadinejad’s backers came looking for us. There will be more protests in other neighbourhoods of Tehran today."

Posted at 9 pm:

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Motorbikes set alight in the streets of Tehran. Video published on Youtube by omid2006.

Published at 5.19 pm:

Video published on Youtube by greenshler.

Posted at 4.35pm:

The loudspeaker says: "Death to the USA. Death to Israel." The crowd reply: "Death to Russia" (referring to Russia's perceived support of Mahmoud Ahmadinejad). Video published here.

Photos posted by Mousavi's wife on her facebook account at 3.32 pm:

Mirhossein Mousavi at the rally.

Mohammad Khatami, a former Iranian president, joins demonstrators.

Posted at 3.20 pm:

Video sent to FRANCE 24.

Posted at 2.55 pm:

Posted on YouTube by madyariran.

Posted at 2.40 pm:

Published on this Facebook page.

Posted on YouTube by aryanbigbang12345

Posted on YouTube by onlymehdi. Demonstrators chant "Karoubi, Karoubi", after the name of a reformist candidate in the disputed June 12 presidential election.

Published on Facebook by Freedom Messenger - Ghasedane AZADI