At least six people were injured after a reported "tear gas attack" at one of the check-in counters in Germany's Frankfurt airport.
Casualties reported suffering breathing problems and the gas was described by officials as an "irritant". People are also being treated for eye injuries.
Firefighters and police were deployed to the scene as people were treated for their injuries.
Frankfurt Airport confirmed the incident had been stood down as of 11.40am after someone sprayed the gas at passengers.
The motive and direct cause of the incident is yet to be assertained.
At least 20 check-in counters were closed while police and fire crews dealt with the incident.