Three men were wounded in a knife attack at the railway station in Winterthur, Switzerland, on May 28, 2026. Police arrested a 31-year-old Swiss-Turkish dual national five minutes after emergency services received the first alert and said investigators believed he acted alone.
The attack began shortly before 8.30am in the station underpass. The victims were Swiss nationals aged 28, 43 and 52. The oldest suffered a thigh wound and remained in hospital after emergency surgery. The two younger men were stabbed in the leg and neck and had either been discharged or were preparing to leave hospital later that day.
Officials described the incident as an act of terror. Mario Fehr, the Zurich cantonal security director, said evidence at the scene pointed toward radicalisation and extremism. President Guy Parmelin said he was shocked by the attack. Those official descriptions set the direction of the investigation; a final judicial determination had not yet been made.
Regional police commander Marius Weyermann said the suspect lived in Winterthur and had drawn authorities’ attention in 2015 for distributing propaganda associated with the Islamic State group. He was born in Switzerland, received Swiss citizenship in 2009 and reportedly spent much of the previous two years in Turkey.
His recent contact with police and medical services also formed part of the inquiry. On the Monday before the attack, he went to a police station and made incoherent statements. Authorities sent him to a psychiatric hospital. He left the next day, was returned to the facility, and on Wednesday a doctor assessed that he was no longer a danger to himself or others. The stabbing occurred the following morning.
Witnesses described people screaming and fleeing as a man moved through the underpass with a knife. One person working nearby reported hearing the phrase “Allahu Akbar” before the assault. A group of schoolchildren was passing through the area, and local reports said a teacher stood in front of them for protection. These were witness accounts rather than independently established evidence of motive.
Winterthur, a city of about 123,000 near Zurich, experienced a rapid armed-police response and station closures around the scene. The arrest quickly ended the immediate threat.
Investigators still had to determine how the suspect’s earlier extremist activity, recent mental-health assessment and actions at the station related to one another. Official use of the terrorism label did not remove the need to establish motive and criminal responsibility through evidence and court proceedings. The medical history was relevant context, but it did not alone explain or legally excuse the alleged conduct.
