Upon initiation of an air quality check using the airport's monitoring systems, authorities discovered an unknown toxin that was spreading in the air.
Schönhardt said there was "no evidence" that the incident was a terrorist attack.
An airport spokesman said that police and firefighters had concluded from their initial investigation the substance was probably pepper spray. Firefighters started examining them to find out whether they had to be taken to the hospital.
Passengers complained of a foul odor before symptoms appeared in what appeared to be a chemical leak.
Those who were evacuated from the airport had to wait outside in sub-zero temperatures.
Ryanair 3Q profits dip, but full-year figures unchanged
Ryanair has said it had to cut its fares more than expected during the last three months of 2016, which pulled down profits . It said these were causing boarding delays as punctuality fell from 90% previous year to 88% over the past nine months.
YouTube GO app finally makes its way to Android
There's an additional social aspect where you can share videos with friends through Wi-Fi Direct instead of burning up your data. It has a streaming catalog of over 30 million songs and lets users save up to 50,000 songs from their own collection on the app.
Facebook Releases New Weather App
Users will have to instead laboriously change the location by returning to the settings menu and invoking the necessary action. Facebook's new app will tell you what the weather is like outside while you're obsessing over the latest on social media.