Police in Switzerland are looking for a suspect after a shooting at an outdoor music party in Aarau, a city in the north of the country. The shooting happened between 2:30 a.m. and 3:00 a.m. at the Schachen horse racing track, where about 3,500 people had gathered for a techno music event. One woman, who was 22 years old and from Italy, died at the scene. Five other people, aged 24 to 27, were taken to hospital with injuries.

Police believe the shooting happened because someone brought guns to the party and started firing as the event ended. They found different types of bullet shells on the ground, which means more than one type of gun was used. Police do not know who did this yet, and they have asked anyone with videos or photos to help find the person responsible.

As a result of this attack, police have blocked roads and are working with police in Germany to find the suspect. The attack is very unusual in Switzerland, where gun laws are known for being strict, and public shootings almost never happen. The police are continuing to investigate and keep the public safe.