Motive behind stabbing of officer at Flint, Mich., airport still unclear, FBI says Officials say the airport in Flint, Michigan, has been evacuated after a police officer was injured.

Officials say the airport in Flint, Michigan, has been evacuated after a police officer was injured. Motive behind stabbing of officer at Flint, Mich., airport still unclear, FBI says Attacker who stabbed officer at Flint, Mich., airport is said to have shouted, 'Allahu Akbar'