Clashes between anti-government protesters and police in Tehran have left at least four people dead. People in Tehran have sent footage from the protests to the BBC and video-sharing sites.
SECURITY FORCES CORNERED BY PROTESTERS, TEHRAN
Footage shows protesters cornering Basij members and taunting them.
Amateur footage shot in Tehran shows protesters cornering members of the Basij militia and taunting them.
The protesters can also be heard telling the militia to chant and denounce the Supreme Leader before they let them go.
The Basij militia is an Iranian volunteer force of Islamic government loyalists which is often called on to the streets at times of crisis to dispel dissent.
BURNING BASIJ MOTORBIKES, ENGHELAB STREET, TEHRAN
Protesters set alight Basij motorbikes
After a clash between protesters and the Basij security forces, the crowds set alight motorbikes of retreating forces.
This confrontation is on Enghelab Street, near Hafez Bridge in central Tehran.
The protesters are shouting "Don't be frightened, we are all together".
Large disturbances took place on exactly this spot 30 years ago, on the traditional Shia day of mourning, Ashura, in 1979, the year of the revolution.
POLICE STATION ATTACKED, VALI ASR SQUARE, TEHRAN
Protesters attack a small police station in Tehran's Vali Asr square
A group of protesters gathered outside a small police station in Tehran's Vali Asr square.
An injured man was carried away from the police station by the protesters.
The protesters appear to ransack the police station, and flames can be seen to the left of it.
TEAR GAS AND BATONS, CENTRAL TEHRAN
Police and anti-government protesters clash in Tehran
Riot police fired tear gas at anti-government protesters in central Tehran.
The two sides engaged in running battles; police wielding batons and protesters throwing rocks.