A techno party takes place in the city of Aarau. A man shoots at people there. This happens on Sunday night. A woman from Italy dies in the attack. She is 22 years old. 5 other people have injuries. One injured woman comes from Germany. The other injured people are men from Switzerland.
The police look for the offender with many officers. They arrest a man on Monday night. He is 43 years old and from Switzerland. The police think: He acts alone. Officers find many cartridge cases at the scene. The man probably uses 2 different weapons.
The motive for the crime is still unclear. The police check different reasons. It can be a terror act. Or a rampage by a single person. A fight between criminals is also possible. Experts now check video clips from guests. The police ask witnesses for help.
