Thousands of anti-government protesters returned to the streets in Serbia on Thursday evening after two days of clashes with loyalists of autocratic President Aleksandar Vucic and riot police that left dozens injured or detained.

Clashes erupted at protests in Serbia between opponents and supporters of the government in an escalation of tensions following more than nine months of persistent demonstrations against populist President Aleksandar Vucic.

Months of anti-government rallies in Serbia lapsed into violence again as supporters of President Aleksandar Vucic clashed with his opponents in three of the Balkan country’s biggest cities.