Police officers secured the area behind a poster advertising the rave where the shooting occurred in Aarau, northern Switzerland, on Aug. 30. One person was killed and five others were wounded, some of them seriously, in a shooting at a rave party in northern Switzerland, local police said. AFP-Yonhap

GENEVA — A suspect has been arrested following a weekend shooting at a rave in northern Switzerland that left one person dead and five wounded, police said Monday.

The 43-year-old Swiss citizen was detained overnight, according to a statement from police in Aargau canton. Investigators said the inquiry into a possible motive is ongoing, and that they currently believe the attack was carried out by a lone perpetrator.

The shooting occurred in the early hours of Sunday in Aarau, the regional capital. Police said a 22-year-old woman died of her injuries at the scene. Four men and one woman, aged between 24 and 27, were taken to hospital with injuries ranging from minor to severe.

Swiss police said all of the victims are residents of Switzerland. Italian Premier Giorgia Meloni said Sunday evening that the woman who was killed and two of the other victims were Italian citizens.

Gun violence of this kind is rare in Switzerland, a country of about 9 million people that maintains relatively high rates of civilian gun ownership compared with other European nations, largely rooted in the tradition of citizens keeping army-issued rifles after military service. Despite that prevalence, fatal mass shootings remain uncommon, and attacks at music events such as raves are unusual in the country.

Under the Swiss legal system, cantonal police lead criminal investigations in their territory, and Aargau prosecutors will decide whether and what charges to file as the inquiry proceeds. Authorities have not said when further details about the suspect or a possible motive will be released.