The shooting occurred in the canton of Aargau, with police writing on social media that the woman died at the scene. Four men and one woman, aged between 24 and 27, were taken to hospital with injuries ranging from minor to severe. All victims are Swiss residents; their names have not been released in line with Swiss privacy rules.
Emergency services have cordoned off the area, and a major police operation involving officers in the neighbouring German state of Freiburg is underway. "The manhunt is continuing nonstop at full speed," police spokesperson Bernhard Graser told reporters. He described the incident as "unique in recent years," noting, "In terms of its nature, this incident is certainly unique in recent years. We don't yet know the full extent of it, but based purely on the circumstances, it is something truly extraordinary. That's why there's such a large police presence."
Police have no information yet about possible motives. Asked whether a terrorist attack was a possibility, Graser said that "the fact that the rave was already winding down suggests that's not the case. A fight could also be a possibility."
Swiss daily Blick reported that attendees initially mistook the shots for fireworks until someone shouted "everyone down." The shooting took place just after the rave ended, and police later took remaining visitors to a nearby gym.
Public shootings are rare in Switzerland despite relatively widespread gun ownership. Police have called for witnesses with video or photos to come forward. Aarau, the town where the incident occurred, has about 22,300 residents and is located 46 kilometres west of Zurich and 30 kilometres south of the German border.