The ministry indicated that embassy officials are being sent to the scene near Zurich to “closely monitor the investigation.”
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Swiss Foreign Minister Ignazio Cassis contacted his counterpart in Italy, Antonio Tajani, and expressed condolences, according to the statement.
Swiss police are searching for at least one armed attacker who opened fire during the rave, killing an Italian woman and injuring five others, some seriously.
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The early morning shooting in the city of Aarau, which forced partygoers to flee seeking cover, is a rare event in this Alpine country despite longstanding gun ownership traditions.
