The FBI and local law enforcement are investigating a stabbing at Bishop International Airport in Flint, Mich., as a possible terrorist attack, a local CBS affiliate reported.

One law enforcement officer is in critical condition, according to the report. Police sources told WMEM that the officer was attacked from behind by someone with a knife of "substantial size."

FBI officials told the station that the incident is being treated as a "possible terrorist attack" and said they believe the attack is an "isolated incident." Airport officials evacuated all passengers, and there are no other known injuries besides the officer.

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Michigan State Police provided updates on Twitter, including confirming that the FBI had taken over as the lead investigators in the aftermath of the stabbing.

The MSP is on scene at Bishop Airport. The officer is in critical condition Please keep the officer in your prayers. The airport is closed pic.twitter.com/QKjaprVObw — MSP Metro Detroit (@mspmetrodet) June 21, 2017

. The FBI is the lead agency in this incident. MSP is providing resources to our Federal and local partners as this scene progresses. — MSP Metro Detroit (@mspmetrodet) June 21, 2017

Michigan Gov. Rick Snyder (R) tweeted out that he is waiting to learn more about the situation and asked for prayers for the officer who was wounded.

As we wait to learn more about the incident at Bishop Airport, please keep the attacked officer in your thoughts & prayers. — Governor Rick Snyder (@onetoughnerd) June 21, 2017

- Updated at 2:13 p.m.