BELGRADE, Serbia — Clashes erupted between Serbian anti-government protesters and supporters for a second day Wednesday in a major escalation after more than nine months of persistent demonstrations against autocratic President Aleksandar Vucic.

The president's supporters repeatedly hurled flares at protesters in the northern city of Novi Sad, near the offices of Vucic's ruling Serbian Progressive Party. Protesters then smashed office windows as riot police were deployed outside to guard the building.

Interior Minister Ivica Dacic said at least one policeman was injured and called for the “return of law and order.”

Thousands more gathered in other parts of the country, including the capital, Belgrade, where riot police used tear gas to disperse groups of anti-government demonstrators in

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