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.

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.

University students have staged almost daily rallies since a concrete canopy at Novi Sad railway station collapsed in November, killing 15 people.

Massive marches have been part of a nationwide anti-graft movement that started after a concrete canopy crashed in November at a railway station in Novi Sad.

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.