Swiss police have escalated the Aarau shooting to an international manhunt, with Fedpol launching arrest warrants through national and international systems
Two Fedpol liaison officers have been sent to Aarau to coordinate the search.
Aargau cantonal police say they still have no information about the gunman or the circumstances of the weekend rave shooting.
A 22-year-old Italian woman was killed and five others were wounded, some seriously but not critically.
The large-scale operation is now into its fourth day.
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