German firefighters have evacuated hundreds of passengers at Hamburg Airport after 50 people were injured by an unknown toxin that possibly spread through the airport's air-conditioning system. <br/><br/>The German news agency, DPA, reported that 50 people complained of breathing problems and burning of eyes and firefighters started examining them to find out whether they had to moved to the hospital. Firefighters designated special areas outside the airport building where physicians were examining those injured by the unknown toxin. <br/><br/>Those who were evacuated from the Hamburg Airport had to wait outside the terminals in sub-zero temperatures.