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Story summary
- Swiss police arrested a 43-year-old suspect in the Aarau rave shooting that killed Italian citizen Maria Spinelli.
- Four men and one woman, aged 24-27, were hospitalized with injuries ranging from minor to severe.
- Police recovered shell casings from a handgun or submachine gun and a possible assault rifle.
- Investigators said the suspect acted alone.
- Motive remains unclear and terrorism was not ruled out.
