London City Airport has been declared safe following a suspected chemical threat on 21 October.
Last week, the fire alarms went off at the airport, leading to the complete evacuation of its terminal.
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Firefighters and police were called to deal with the incident, which might have been caused by a tear gas (CS) spray found at the airport.
London City Airport spokesperson said: "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.”
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By GlobalDataThe airport was reopened after nearly three hours and is currently running normally, reported BBC.
Among the 500 people evacuated during the incident, two were taken to hospital, while 26 others were treated for breathing problems at the scene.
London City Airport currently serves more than 40 destinations across Europe and the US, with connections to the rest of the world through major European hubs.
