Fresh report from the AP:
In some places, police struck hard. Security forces chased after protesters, beating them with clubs on Valiasr Street, Tehran's biggest north-south avenue, witnesses said.
Women in headscarves and young men dashed away, rubbing their eyes as police fired tear gas, in footage aired on state-run Press TV. In a photo from Thursday's events in Tehran obtained by The Associated Press outside Iran, a woman with her black headscarf looped over her face raised a fist in front of a garbage bin that had been set on fire.
(More photo details here)