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The incidents began shortly after 7 p.m. and, according to the information, a group of people attacked the police, who proceeded to use tear gas, flash grenades and chemicals.
Metro trains pass through Nikaia and Korydallos stations without stopping, as the stations closed earlier due to concentration.
The Keratsini-Drapetsonas Labor Club and the Nikaia-Renti Citizen Movement had called for a demonstration against the police and repression at 6 pm in Davaki Square in Nikaia.