Bishop International Airport in Flint, Michigan, was evacuated on Wednesday after a police officer was stabbed in the neck, authorities said.
All passengers were safe, according to a brief statement on the airport's Facebook page.
The officer was stabbed inside the airport's main terminal and taken to a hospital, Michigan State Police spokesman David Kaiser said in a telephone interview from the airport.
The officer was in critical condition and the Federal Bureau of Investigation is leading an investigation of the incident, the state police said in a statement.
Police have taken a "person of interest" into custody, Flint Mayor Karen Weaver said in a statement. Officials increased security at Flint City Hall, including additional police officers, in "an abundance of caution," her statement said.
An FBI spokesman did not respond to requests for comment.
Bishop Airport is a small regional airport with two runways that on average has 16 commercial flights arriving or departing each day, according to FlightAware, a flight tracking service. The airport warned of potential cancellations and delays on Wednesday.
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