Anti-government protesters barred access to the offices of state broadcasters in Serbia's capital Belgrade and the second-largest city on Tuesday, keeping employees out and forcing some live programming off the air.

Several hundred students have blocked Serbia’s public television station building in Belgrade as tensions soar in the Balkan country days ahead of a planned large rally billed as an endgame in months of massive anti-government protests.

Serbian protesters blocked offices of the state broadcaster in the capital and second-largest city Novi Sad overnight, in a bid to draw attention to their months-long rallies against the rule of President Aleksandar Vucic.