Violence escalated across Serbia as anti-government protests entered their fifth consecutive night. In Valjevo, masked protesters set fire to the ruling Serbian Progressive Party (SNS) offices before clashing with riot police.

The situation has put pressure on Serbia's increasingly autocratic President Aleksandar Vucic, who has refused the protesters' demand to call an early parliamentary election.

Anti-government protesters demolished the offices of the ruling Serbian Progressive Party (SNS) in the northern city of Novi Sad and clashed with police and SNS supporters in the capital Belgrade on Thursday,