BELGRADE, Serbia — Tens of thousands of anti-government protesters marched again in Serbia on Monday, with shielded riot police guarding the Belgrade headquarters of President Aleksandar Vucic, who has threatened a major crackdown against those demonstrating his populist rule.

The protest led by high school and university students marked 10 months since a concrete canopy collapsed at a train station in Serbia’s northern town of Novi Sad, killing 16 people. The disaster ignited a wave of public outrage, with state corruption and negligence cited as a major cause.

The protests Monday were held in the capital of Belgrade and several other towns in Serbia. In Novi Sad, baton wielding police charged against the peaceful protesters, slightly injuring some of them, according to local portals.

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