World·NewSwiss police said on Monday that they had arrested a 43-year-old suspect in relation to a ‌deadly shooting incident at a rave in the town of Aarau on the weekend.43-year-old Swiss man in custody after shooting early SundayThomson Reuters · Posted: Aug 31, 2026 8:02 AM EDT | Last Updated: 28 minutes agoListen to this articleEstimated 1 minuteThe audio version of this article is generated by AI-based technology. Mispronunciations can occur. We are working with our partners to continually review and improve the results.Police cordon tape at the entrance to the Schachen horse racing track and the site of a rave party, following a deadly shooting incident at an event on Sunday, in Aarau, Switzerland, on Monday. (Denis Balibouse/Reuters)Swiss police said on Monday that they had arrested a 43-year-old suspect in relation to a ‌deadly shooting at a rave in the town of Aarau on the weekend.A 22-year-old Italian ​woman was killed and five ​people injured after the shooting at the event at a covered horse ​race track in the early hours of ⁠Sunday morning.Police ⁠launched a ‌massive operation and just before 1 a.m. on Monday arrested a 43-year-old Swiss man on suspicion of carrying out the attack, ⁠it said."Investigations into the exact circumstances of the incident, as well as its background ‌and possible motive, are currently underway. At this stage, it is assumed that a single perpetrator was involved," police in ​the canton of Aargau said in a statement.Police on ⁠Sunday said they were investigating three possible motives ⁠for the shooting, including a mass ⁠shooting, ⁠an act ​of terrorism or an unknown criminal motive.Cartridges found at ​the crime ⁠scene indicated two calibers of bullets, possibly from a pistol and a second, larger weapon, potentially an assault rifle, police said.