A man stabbed three people at a train station in Zurich Thursday morning while yelling “Allahu Akbar,” Arabic for “God is greatest,” as bystanders, including a group of kindergartners, scattered and fled.

The Kantonspolizei Zürich (Zurich Canton Police) issued a brief statement about the attack.

“Shortly after 8:30 a.m., a man injured three people with a bladed weapon at Winterthur train station,” the police stated. “The suspected perpetrator was arrested by police. He is a 31-year-old Swiss national. The three injured individuals are Swiss nationals aged 28, 43, and 52. All three were taken to the hospital. The motive for the attack is under investigation.”

The Zurich Canton Police said that also deployed to work on the case were Winterthur City Police, the SBB Transport Police, the Winterthur Rescue Service, Protection & Intervention Winterthur and Protection & Rescue Zurich.

While the motive remains under investigation, analysts point to the suspect’s shout of “Allahu Akbar” to speculate that it was an Islamist terror attack.