A spokesperson for London City Airport said:
"We apologise to passengers for the inconvenience caused today when an alarm was activated, triggering a full evacuation of the airport terminal. Passengers were evacuated safely and we thank them for their patience. Following the evacuation, some individuals reported feeling unwell and were treated at the scene by London Ambulance Service.
"Emergency services responded to the evacuation, citing a possible chemical incident with firefighters and police officers jointly conducted sweeps of the airport building. The search of the airport led to the discovery of what is believed to be a CS gas spray. Whilst the cause of the incident has yet to be confirmed, officers are investigating whether it was the result of an accidental discharge of the spray.
The airport was declared safe and reopened at approximately 1900. Passengers are advised to contact their airline for the latest information regarding their flights.'
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