A manhunt is underway after a deadly shooting at a rave in northern Switzerland overnight into Sunday, police said.Aargau Cantonal Police said one person was killed and five others were wounded after shots were fired at the event in the town of Aarau, a scenic area known for its lush valleys, medieval castles and thermal springs.A 22-year-old woman died at the scene, police said, while four men and one woman, aged 24 to 27, are being treated in hospital for injuries ranging from minor to severe.All of the victims held Swiss residency, police said. CNN affiliate Sky24 reported that the woman who died was an Italian national.The shooting happened at the Schachen horse racing track in the town, police said. Despite attempts to save her, she succumbed to her injuries, the eyewitness told Blick.A large area around the venue has been cordoned off, and police have asked members of the public to stay away from the area.Switzerland has one of the highest rates of gun ownership in Europe, although shootings are rare.