"Based on the information that we have at this time, we believe this to be an isolated incident," said the FBI, adding that it had "no specific, credible information that there is a threat to the Flint community."
No passengers were harmed in the assault, according to the airport which was evacuated and remained closed until further notice.
The injured police officer, identified as Jeff Neville, was out of surgery and in stable condition, a Michigan State Police spokeswoman told AFP.
NBC News reported that the suspect stabbed the officer multiple times while shouting "Allahu Akbar" -- which means "God is greatest" in Arabic.
The FBI said authorities were "aware of reports that the attacker made statements immediately prior to or while attacking the officer."
"The FBI, with our local, state and federal law enforcement partners, is jointly investigating this incident to determine the nature and motive for the attack," the agency said.
NBC cited law enforcement officials as saying the suspect was from Quebec and has a Canadian passport.
(This story has not been edited by NDTV staff and is auto-generated from a syndicated feed.)
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