Bishop International Airport in Flint, Michigan has been evacuated after an officer was stabbed. Picture: Supplied

A witness at the airport told MLive that he saw the officer on his knees, bleeding form the neck.

“The cop was on his hands and knees bleeding from his neck,” said Ken Brown, who was dropping his daughter off at the airport. “I said they need to get him a towel.”

The suspect was then reportedly arrested while the officer was rushed to hospital in a critical condition.

Airport officials wrote on Facebook that all passengers are safe and are being evacuated.

“Please check with your airline for potential cancellations or delays. We will release more information as we have it,” the statement adds.

The statement did not provide further details about the incident and said all passengers were safe.