Two people were taken to hospital. London City Airport staff confirmed that the airport was evacuated for several hours. Hundreds of passengers were ordered to leave the terminal building and flights grounded after passengers suffered difficulties breathing. Police and firefighters scoured the airport following the alert. They discovered a CS spray (or tear gas, used to control riots. Exposure causes a burning sensation, mucous nasal discharge, disorientation, and difficulty breathing, even partially incapacitation. It’s believed that an accidental discharge pf the spray occurred from a baggage. Under UK firearm law, CS and other similar sprays are classed as prohibited weapons, making it unlawful for a member of the public to possess them The airport was declared safe at around 7pm after a three-hour joint-force investigation. A complete investigation is ongoing.