"We are aware of reports that the attacker made statements immediately prior to or while attacking the officer, but it is too early to determine the nature of these alleged statements," the FBI statement said.
A "person of interest" in the incident was taken into custody by police, Flint Mayor Karen Weaver said in a statement, adding that security was increased at Flint City Hall out of "an abundance of caution."
The officer who was stabbed, Lieutenant Jeff Neville of the airport's Department of Public Safety, is in stable condition after undergoing surgery, according to a Michigan State Police spokeswoman.
All passengers are safe and were evacuated, the airport said on Facebook. The airport remained closed on Wednesday afternoon.
Bishop Airport is a small regional airport with two runways that has, on average, 16 commercial flights arriving or departing each day, according to FlightAware, a flight tracking service.
More about:
