Some people experienced headaches and nausea and were taken to hospital for observation, though none were in serious condition.

Mayor Balaicz Zoltán said authorities, including the police and disaster management, confirmed that a student had probably endangered others.

The jar contained a substance that reacts with moisture, causing the illnesses.

Police began an investigation, treating the incident as endangerment rather than a simple prank.

MTI Stock Photo - for illustrative purposes only

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