A 43-year-old Swiss man has been arrested after a shooting at a techno rave in the Swiss town of Aarau left a 22-year-old woman dead and five other people injured.The incident took place early Sunday at the Schachen race track, where thousands of people had gathered for a rave. According to the BBC, police launched an extensive search for the suspected gunman after receiving reports of shots being fired at around 02:30 local time.Aarau canton police said the suspect was detained shortly before 01:00 on Monday, ending a manhunt that lasted almost a day. Investigators are now working to establish what led to the shooting and whether the suspect had any connection with those attending the event.Young woman dies at scene after shootingThe woman killed in the attack was identified as 22-year-old Italian national Maria Spinelli.She died at the scene, while five other people were taken to hospital. The injured group consisted of four men and one woman, aged between 24 and 27, with their conditions reportedly ranging from minor injuries to more serious wounds.Police said their investigation was continuing and that, at this stage, they believed the suspected attacker had acted alone.The shooting occurred at a venue that had been prepared for a major electronic music event, with organisers expecting about 3,500 people to attend.Gunfire erupted after music stoppedAn eyewitness described a sudden and frightening change in atmosphere when the gunfire began.Speaking to Swiss media, the witness said he initially thought the sounds were fireworks. The shots came only minutes after the music had stopped.He later said another man and a woman told him to hide. The woman was subsequently shot, according to the eyewitness account.The incident sent people at the event into confusion as emergency services and police responded to reports of gunfire at the race track.Police launch overnight manhuntThe shooting triggered a major police operation across the region as authorities searched for the suspected attacker.Aarau is around 46km west of Zurich and has a population of roughly 23,000. The town is also located less than 40km from the German border, with German police reportedly assisting their Swiss counterparts during the search.The suspect was eventually taken into custody shortly before 1am on Monday.Authorities have not yet established a motive. Police are examining the circumstances surrounding the attack, including what happened immediately before the gunfire and the relationship, if any, between the suspect and the victims.Italy follows investigation into citizen’s deathThe killing of Spinelli has also drawn attention from Italian authorities because the victim was an Italian national.Italian Prime Minister Giorgia Meloni said she was confident Swiss investigators would establish what happened and identify those responsible.Italy's foreign ministry said it had dispatched officials to Zurich to closely follow the investigation and provide assistance in connection with the death of the Italian woman.The case is therefore being closely watched in both Switzerland and Italy as investigators work to establish the circumstances behind the fatal shooting.Switzerland has high gun ownership but shootings are uncommonThe attack has also renewed attention on Switzerland's relationship with firearms.Switzerland has one of Europe's highest rates of gun ownership, although serious gun violence is relatively uncommon. The country has introduced tighter firearms controls in recent years.The last major mass shooting in Switzerland occurred in 2001 in Zug, near Lucerne. A gunman killed 14 members of the local parliament and government before taking his own life.The Aarau shooting is markedly different in circumstances, occurring during a large public gathering attended by thousands of people.For investigators, the immediate priority remains determining the motive and reconstructing the sequence of events that led to the gunfire. Police have said they currently believe the arrested man acted alone, while the investigation into the attack remains ongoing.