BELGRADE: Police in Serbia have arrested several people accused of allegedly plotting to overthrow the government as tensions soared ahead of a major anti-government rally planned this weekend in the capital Belgrade.

Police said six were detained on Wednesday evening, suspected of “preparing criminal acts against the constitutional order and security of Serbia” and “calling for violent change of the constitutional order.”

At least one other university student was arrested earlier this week accused of preparing “an act of terrorism” based on his private conversations over a mobile phone. Hundreds on Thursday demonstrated against the arrest in Belgrade.

Protesting university students have called Saturday’s rally to press their demand for an early election after nearly eight months of almost daily anti-corruption demonstrations that have shaken the populist government of President Aleksandar Vucic.

Persistent protests started in November after a renovated rail station canopy collapsed that killed 16 people and which many blamed on rampant government corruption and negligence in state infrastructure projects. University students have been a key force behind the nationwide movement.