BELGRADE, Serbia — Serbian President Aleksandar Vucic on Sunday announced tough measures against antigovernment protesters following days of riots in streets throughout the country that have challenged his increasingly autocratic rule in the Balkan country.

Thousands of people defied Vucic’s threat of a crackdown and protested later Sunday in various Serbian cities, including the capital, Belgrade. Shouting, “Arrest Vucic,” the protesters demanded that all demonstrators arrested in recent days be released. No incidents were reported.

In one of his frequent TV addresses to the public, Vucic accused the antigovernment demonstrators of “pure terrorism” and reiterated his claims that months of persistent protests against his rule have been orchestrated by the West and are aimed at destroyi

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