Flint Airport Michigan evacuated after police officer critically injured; FBI investigating.

The Bishop International Airport in Flint, Michigan, was being evacuated this morning after an airport police officer was injured, the airport said.

The officer is in critical condition, according to the Michigan State Police.

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The airport said all passengers were safe.

The airport is closed and the FBI is leading the investigation, authorities said.

DEVELOPING: Airport in Flint, Michigan evacuated after airport police officer critically injured; FBI investigating. https://t.co/HFZiYzcCeI

— ABC News (@ABC) June 21, 2017