Swiss officials call Winterthur knife attack a terrorist act; suspect shouted 'Allahu akbar'

A man reportedly shouting 'Allahu akbar' injured three people in a knife attack at a train station in Switzerland on Thursday before being arrested, in what officials described as a 'terrorist act.' The assault, which unfolded during the morning rush hour at Winterthur's main station, Switzerland's sixth-largest city, sent commuters and schoolchildren fleeing in panic.

Authorities identified the suspect as Nesip Dedeler, a 31-year-old Swiss-Turkish dual national who had been discharged from a psychiatric clinic earlier in the week. Witnesses said the man, with long dark hair and a full beard, ran through the station wielding a knife and shouting 'Allahu akbar' (God is the greatest).

'I am exceptionally calling this a terrorist attack,' said Mario Fehr, the security chief for the canton of Zurich, during a press conference. Regional police commander Marius Weyermann agreed, telling reporters that 'from the scene, it was clear the motive for this act must be sought in the realm of radicalisation and extremism.'

Police received the first emergency call at 8:28 a.m. local time and arrested the suspect five minutes later. The three victims—men aged 28, 43 and 52—suffered stab wounds; the eldest, with a severe wound to his thigh, required emergency surgery.

Swiss President Guy Parmelin said he was 'shocked by the terrorist attack... This deeply affects me,' and thanked emergency services. The Islamic Central Council of Switzerland (IZR) condemned the attack as a 'cowardly and barbaric act,' distancing Islam from the perpetrator's actions.

Investigators revealed that Dedeler had been known to authorities since 2015, when he faced a complaint for allegedly spreading propaganda for the Islamic State (IS) jihadist group. He also had links to a radical mosque whose imam was charged in 2017 with calling for the murder of non-practicing Muslims. Yet his recent history pointed to severe mental health struggles. He showed up at a police station on Monday speaking incoherently and was taken to a psychiatric clinic, but doctors released him the next day, determining he posed no threat.

'Why that decision was made is beyond our knowledge, but the assessment was obviously wrong,' Fehr acknowledged, raising questions about the intersection of mental health care and counterterrorism screening. The attack has reignited debate in Switzerland about the effectiveness of deradicalization programs and the challenges of monitoring individuals with both extremist ties and psychiatric conditions.

Winterthur, a city of about 110,000 residents, had not experienced a similar assault in recent memory. Security analysts note that while Switzerland has remained relatively insulated from the wave of lone-wolf attacks that have struck neighboring European countries, the country's open train stations and public spaces remain vulnerable. The incident is expected to prompt a review of psychiatric discharge protocols and closer cooperation between mental health authorities and police.

A 65-year-old taxi driver, Turhan Muslu, told local newspaper Blick that he saw Dedeler rush off a station ramp and attempt to stab a man, who 'fought back fiercely.' Station guards subdued the attacker within minutes. Mobile phone footage showed Dedeler running past a group of young children on a school trip without stopping. 'I still have goosebumps,' said a witness who heard the suspect scream 'Allahu akbar' five or six times.

The suspect grew up in Winterthur, becoming a naturalized Swiss citizen in 2009, but spent most of the past two years in Turkey. Officials have not yet determined whether he was radicalized abroad or locally. As the investigation continues, the case highlights a growing challenge for European security forces: how to identify threats from individuals who drift between radicalization and mental illness.