At least eight injured in unrest.
A huge fire has broken out at the notorious Evin jail in Iran's capital, where political prisoners and anti-government activists are held.
The state news agency says eight people were injured in the unrest.
It erupted after weeks of protests over the death of a woman in detention for "inappropriate attire".
MIddle East expert, Dr Sanam Vakil, says there are many reasons for the violence.

Exit Polls Suggest No Clear Winner In Israeli Election
Netanyahu Seeks Another Term As Israeli Elections Get Underway
Russian Strikes Leave 600,000 People Without Power
Robert Pether Returning To Ireland After Five-Year Iraqi Detention