An unknown person should have sprayed an irritating substance at the check-in counters in Terminal 1.
UPDATE 6 people reported injured.
Multiple people have suffered breathing problems after a tear gas attack at Frankfurt airport, local media reports.
Injuries were reported at the check-in counters around 11am on Monday.
Emergency services have been called to the scene.
Airport police said in a tweet that the gas was sprayed by an ‘unknown person’ and that investigations are still ongoing.
It is not clear whether the attacker has been apprehended, or what their motives may have been.