The opposition has taken to the streets of Tehran, Isfahan, Shiraz, Tabriz and Kermanshah in Iran in defiance of a government ban.
Marching silently at first, thousands of people have answered the call of their leaders Mirhossien Moussavi and Mehdi Karroubi to show their support for the popular uprisings in Tunisia and Egypt.
However a huge security presence in Tehran has prevented the crowds from reaching the central Azadi square, and latest reports say police have fired tear gas and are chasing down protesters on motorbikes with electric shock prods and making arrests. Dozens of protesters have been arrested, according to Moussavi’s website.
Foreign media has been banned from covering the events so all the information is coming from social media sources, despite the internet being restricted and the mobile phone network being shut down. Several tube stations have also been closed.
Here is a selection of amateur footage: