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.

A wave of anti-corruption protests has gripped Serbia since November, when the collapse of the Novi Sad railway station roof killed 16 people, a disaster widely blamed on entrenched corruption.

Anti-graft protesters again gathered in several cities across Serbia late Thursday.

That was mainly in response to a previous attack by governing party supporters on demonstrators Tuesday in the town of Vrbas, about 160 kilometres (100 miles) north of the capital Belgrade.

Large groups of pro-government supporters, most wearing masks, confronted protesters on Wednesday, and the two groups hurled bottles, stones and f

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