Swiss man arrested after rave shooting kills Italian woman

Swiss police arrested a 43-year-old man suspected of shooting at a rave in the city of Aarau, where a young Italian woman was the victim.

Consensus

A shooting occurred at a rave party on the city racecourse in Aarau, Switzerland.
The shooting took place around 2:30 local time (3:30 MSK).
A 22-year-old Italian woman, Maria Spinel, was killed at the scene.
Five people aged 24–27 were hospitalized with injuries of varying severity.
A 43-year-old man was arrested by Swiss police in connection with the incident.
The police are investigating the event and considering possible motives including mass murder, terrorism, or an unknown criminal motive.
Bullet casings from two different calibers were found at the scene — one from a pistol and another from a larger weapon, possibly a assault rifle.
The suspect was apprehended around midnight, nearly a full day after the shooting began.
The police confirmed the suspect acted alone.

The police are investigating whether the shooter was alone or if it was a shootout, and if the shooter used two weapons, it may indicate a single perpetrator using two firearms. — kommersant
The police confirmed the suspect acted alone in their official statement. — tg_bbcrussian
The police are considering the possibility of a terrorist attack as a motive. — kommersant
The police have not confirmed any specific motive but are investigating the sequence of events and circumstances. — tg_bbcrussian
The shooting occurred at a city racecourse in the Schachen district of Aarau. — kommersant
The event took place on a racecourse in Aarau located several tens of kilometers from Zurich. — tg_bbcrussian