MICHIGAN airport has been evacuated after a witness saw an officer bleeding from his neck and a knife nearby on the ground.
Michigan State Police have reported on Twitter that the officer is in a critical condition and the FBI was leading the investigation into the incident which happened yesterday.
Bishop International Airport posted on Facebook that passengers were safe and were being told to check for flight delays or cancellations.
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A witness has told a local newspaper he was dropping off his daughter at the airport and saw the officer bleeding from his neck. He says he saw a man detained by police and a knife on the ground.
According to 9NEWS, the attack is being treated as an act of terrorism.