Nearly 70 people have been taken ill at Hamburg Airport after "nasty odours" were pumped through the terminal's air-conditioning system. All flights were stopped after scores of people reported "respiratory irritation" at the airport. People were treated for coughing, breathing problems and burning eyes by paramedics at the scene. Medics raced to the terminals 1 and 2 to treat holidaymakers who had reported feeling unwell. Airport officials stopped air traffic from 12.20pm (local time) but they resumed more than an hour later. Minutes after the airport was struck by the suspected gas leak, a subway station was also evacuated in the city centre. Unconfirmed reports suggested the Hamburg station had been evacuated by "a gas incident". Unconfirmed reports suggest 50 people have been taken to hospital for treatment. Hundreds of evacuated passengers are now waiting outside the airport in sub-zero temperatures. It is understood an unknown toxin has been spread through the airport's air conditioning system, AP reports. The fire brigade has set up treatment centres for the injured. Hamburg is Germany's fifth biggest airport, handling 16 million passengers a year.