FLINT, Mich. (AP) — A Canadian man from Tunisia shouted in Arabic before stabbing a police officer in the neck at a Michigan airport, and referenced people being killed overseas during the attack that’s now being investigated as an act of terrorism, federal and court officials said.

Amor Ftouhi, 49, of Montreal, was immediately taken into custody. A criminal complaint charging him with committing violence at an airport says Ftouhi asked an officer who subdued him why the officer didn’t kill him.

The attack Wednesday at Bishop International Airport in Flint, Michigan, is being investigated as an act of terrorism, but authorities have no indication at this time that the suspect was involved in a “wider plot,” said FBI Special Agent in Charge David Gelios.

“At this time we view him as a lone-wolf attacker,” Gelios said. “We have no information to suggest any training.”

The criminal complaint says Ftouhi stabbed airport police Lt. Jeff Neville with a large knife after yelling “Allahu akbar,” the Arabic phrase for “God is great.” According to the FBI, Ftouhi said something similar to “you have killed people in Syria, Iraq, and Afghanistan, and we are all going to die.”

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