In Lucerne, residents complained on Friday night about the increasingly loud music from a rave being held in a military barracks, said a report in the Tribune de Genève newspaper.
After negotiations with the party’s organizers to lower the volume failed, about 120 participants clashed with the officers. Several police vehicles were damaged in the commotion, said the paper.
On Saturday night, police in Zurich seized musical equipment and attempted to evacuate revellers from an illegal party under a bridge. As the tension grew, the officers used rubber bullets and tear gas to fend off the crowd, the paper said.
Some 80 partygoers responded by hurling stones and glass bottles at the officers. There were no reports of injuries, according to the paper.