A large environmental protest
Tens of thousands gathered in central Zagreb to protest delays in cleaning up more than 30,000 tonnes of waste stored in central Croatia.
Water safety is the central concern
Environmental groups say the stored material threatens drinking-water sources, turning the issue from a local waste dispute into a broader public-health concern.
Pressure on the government
The size of the demonstration increases pressure on Croatian authorities to accelerate cleanup work and provide clearer timelines and environmental monitoring.