Polar temperatures did not prevent Isabella and her friends, aged 15 to 18, from meeting in Zurich Stadelhofen on Saturday evening. They come from Winterthur, Basel and even Solothurn. “With us nothing is happening, the streets are empty. There are lots of people here, the police, it’s funny, ”said the young woman bundled up in her parka. “We listen to music, we dance.” “And if that’s not enough to warm up, we have alcohol. Or chases with the cops! ” adds her friend, mask on her chin, in a broad bright red smile. A few minutes later, the barking of dogs resounded on the quay opposite. Teenagers scamper away to escape police control.