The FBI has identified the suspect in the MI airport stabbing on Wednesday as a Canadian resident and is investigating the case as an act of terrorism.
"I think it's sufficient to say he has a hatred for the United States and a variety of other things, which in part motivated him towards coming to the airport today to conduct this act of violence", the Federal Bureau of Investigation special agent said.
Lieutenant Neville was in stable condition after initially being declared as "critical".
9:10: Ftouhi goes up an escalator to the second level of the airport where he turns left to go to a restaurant.
Gelios said that an investigation is under way into the attack, noting that Canada is cooperating in assembling evidence with an eye toward determining what links Ftouhi might have with the USA northern neighbor.
Kamel Yahyaoui said in a Facebook exchange with The Canadian Press he has known Ftouhi for 20 years and that they first met in Tunisia when Ftouhi was a school teacher.
After the stabbing, officials stationed police officers at Flint City Hall a few miles away.
Ftouhi was initially charged with "violence at an worldwide airport" and additional charges may be filed.
He also asked the victim why he didn't kill him, according to Sondgeroth.
- June 16: Ftouhi legally enters the USA through Champlain, New York, and starts heading to MI. "We have no information to suggest any training".More news: Lewis Hamilton: "We delivered a real blow to the Ferrari's"
No passengers were harmed in Wednesday's assault, Bishop International officials said. "I've never had any problems with him", Piazza said, CBC News reported.
The injured officer is in "satisfactory" condition, authorities said.
It took four people to subdue Ftouhi, including the officer he stabbed and a nearby maintenance worker, said Chris Miller, the airport's director of public safety.
Police investigators walk into the residence of Amor Ftouhi, in Montreal, Quebec, Canada, June 21, 2017.
A U.S. official told CNN that, based on preliminary information, it appears Ftouhi has traveled between the United States and Canada multiple times.
As a police officer in 1996, Neville coordinated a sting operation aimed at rounding up parents wanted on arrest warrants for failing to have paid child support.
Witnesses described seeing the suspect being led away as Mr Neville was bleeding and a knife on the ground. He has lived crime-free since then, and the pardon should allow him to fight deportation, Cuomo said.
"We as the people of Flint must remain united against such senseless acts of violence, and in particular against law enforcement officers", he added.
Meanwhile police in Canada have been searching a flat in the east end of Montreal following the attack, as a number of police were pictured standing guard outside.
"We're trying to develop further information as to his timeline and where he went after he entered the United States", he said.