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Police officers gather at a terminal at Bishop International Airport, Wednesday morning, June 21, 2017, in Flint, Mich. Officials evacuated the airport Wednesday, where a witness said he saw an officer bleeding from his neck and a knife nearby on the ground.  On Twitter, Michigan State Police say the officer is in critical condition and the FBI was leading the investigation. (Dominic Adams/The Flint Journal-MLive.com via AP)
Police officers gather at a terminal at Bishop International Airport, Wednesday morning, June 21, 2017, in Flint, Mich. Officials evacuated the airport Wednesday, where a witness said he saw an officer bleeding from his neck and a knife nearby on the ground.  On Twitter, Michigan State Police say the officer is in critical condition and the FBI was leading the investigation. (Dominic Adams/The Flint Journal-MLive.com via AP)

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FBI investigating stabbing as possible terrorism

The FBI is investigating whether terror was the motive behind the stabbing of a police officer at a Michigan airport. CNN's Rene Marsh reports.

FBI investigating stabbing as possible terrorism

The FBI is investigating whether terror was the motive behind the stabbing of a police officer at a Michigan airport. CNN's Rene Marsh reports.