The demonstration was sparked after Mostafa Rassouli-Nia was sentenced to death for allegedly killing an agent of Irans State Security Forces (SSF) during anti-government protests earlier this year.
Tuesdays demonstrators sounded horns and chanted slogans against Rassouli-Nias sentence.
They gathered in Esteghlal Square and near Hassanzadeh School and the protest soon spread to other parts of the city.
SSF units, however, attacked the protestors with teargas canisters. Clashes broke out between the people who chanted anti-government slogans and agents of the SSF.
Several hit-and-run clashes continued into the day on Wednesday.
Over the summer period, there were continuous anti-government protests in Irans Kurdish regions. A number of demonstrators were killed by agents of the SSF who were attempting to prevent an escalation of dissent.
