Tens of thousands of protesters converged in Serbia's capital Belgrade Saturday during the latest in a series of anti-corruption demonstrations to upend the Balkan country in recent months.

As a sea of people flooded the streets of downtown Belgrade, the rally was likely set to be the single largest protest since the anti-graft movement first coalesced.

The movement formed after 15 people were killed when a railway station roof collapsed in the city of Novi Sad in November.

The railway station disaster ignited long-simmering bitterness over alleged corruption and lax oversight in construction projects.

But with supporters of President Aleksandar Vucic's embattled government also mobilising in the capital as well, there was growing concern about the risk of clashes.

In statements issued on social media, students urged those attending the rally to act "in a calm and responsible manner".

"The purpose of this movement is not an incursion into institutions, nor to attack those who do not think as we do," read one statement.

"This movement must not be misused."

The rally was due to officially start at 4:00 pm (1500........

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