UPDATE: Feb. 12 at 4:03 p.m.
Officials say pepper spray is likely the material that spread through the air conditioning system at Germany's Hamburg Airport Sunday.
Authorities are still working to determine how it got into the airport's air conditioning system.
Reports say at least 68 people complained about breathing problems, burning eyes and nausea. Fourteen flights were canceled and several planes were diverted because of the incident.
Hundreds of people were evacuated from Germany's Hamburg Airport after at least 50 people were injured by an unknown toxin that may have spread through the airport's air conditioning system.
The German news agency dpa reported 50 people complained about breathing problems and burning eyes.
Evacuated passengers had to wait outside in sub-zero temperatures.
Some observers said the airport smelled like gas.
Rough translation: "Report about gas leak: Hamburg Airport completely blocked."
The Associated Press contributed to this report.