Authorities said Ftouhi had expressed "hatred for the United States" during questioning in custody, and were conducting joint operations in Canada and the USA in the wake of the stabbing.
Map locating Flint, Mich., where officer was stabbed in airport.
Amor Ftouhi, 49, kept the building stairwells clean and always paid his rent on time, Luciano Piazza told The Associated Press. He's charged with committing violence at an airport.
The FBI also said Ftouhi yelled "Allahu akbar" as he allegedly stabbed Neville.
"He further exclaimed something similar to, 'you have killed people in Syria, Iraq, and Afghanistan, and we are all going to die, '" Federal Bureau of Investigation agent Thomas Sondgeroth wrote in a criminal report of the stabbing.
The stabbing occurred in a public area of the airport that is not subject to TSA security.
Neville's condition was upgraded from critical to stable.
The attack occurred just before 10am local time, prompting officials to evacuate and shut down the airport and add security elsewhere in the MI city of Flint. The FBI is leading the investigation. He was "proud of the swift response" by authorities of both nations, he said in a statement. A suspect was in custody.
A spokesperson for the Canadian Embassy in Washington said its government and law enforcement agencies are "engaged and are cooperating fully" with their American counterparts.
The suspect is said to be from Quebec and has a Canadian passport.
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His arrival was followed by a flypast by the world's largest passenger plane, the Airbus A380, and France's aerial display team. He said Airbus still aims to deliver 200 A320neo planes despite some problems with one of the two engines available to clients.
10 a.m.: This article was updated to report the officer's condition and to include a tweet from Gov. Rick Snyder.
A small regional airport, it has, on average, 16 commercial flights arriving or departing each day, according to FlightAware, a flight tracking service. A law enforcement official said the stabbing appears to have targeted law enforcement. Mr Miller and another officer also assisted. He did undergo surgery that went well after being stabbed in the neck and back.
No other threats have been identified, Shaw says.
Ftouhi never went through any security screening, Gelios said. Neville retired from that department as a lieutenant.
"Right now we are still awaiting more information about the situation at Bishop Airport this morning", said Flint mayor Karen Weaver. Television footage showed the four-level building surrounded by a police cordon as three women with concealed faces were led away by authorities.
Cherie Carpenter, a witness to the stabbing, told local news the male assailant appeared "blank, just totally blank" after he was arrested by local police. The airport was evacuated and remained closed until 5 pm (2100 GMT).
Royal Canadian Mounted Police did not immediately return Reuters requests for comment.
Bishop International Airport posted Wednesday on Facebook that the officer was hurt but offered no details about the incident. "All passengers are safe and are being evacuated at this time".
"The cop was on his hands and knees bleeding from his neck", Ken Brown told The Flint Journal. He says he saw a man detained by police and a knife on the ground.
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