More from Al Jazeera:
There are reports in social media sites and non-state Iranian news sites of clashes between protesters and security forces in Tehran, the Iranian capital.
Thousands of demonstrators were marching on Monday on Enghelab and Azadi streets [which connect and create a straight path through the city centre], with a heavy presence in Enghelab Square and Vali-Asr Street, according to these reports.
Several clashes have been reported on Twitter, the micro-blogging site, with claims of some demonstrators being teargassed and others beaten and arrested.
Al Jazeera's Dorsa Jabbari, in Tehran, confirmed reports that security forces used tear gas, pepper spray and batons against the protesters.
She said up to 10,000 security forces had been deployed to prevent protesters from gathering at Azadi Square, where the marches, originating from various points in Tehran, were expected to converge.