Protests started last year after deadly collapse of rail station roof, with President Vucic accused of corruption.

Clashes between rival groups of protesters in Serbia flared again late Thursday, police said, as months of anti-government demonstrations boiled over into street violence this week.

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