A section of Heathrow Airport was evacuated on Monday evening after concerns over a potential hazardous substance, according to the London Fire Brigade.
The incident led to the closure and evacuation of the check-in area at Terminal 4, a Heathrow spokesperson confirmed. Officials described the move as a precaution while emergency crews assessed the situation.
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Passengers were urged not to travel to Terminal 4, and large crowds were seen waiting outside.
Operations at the airport’s other terminals continued without disruption.
See more: Heathrow Terminal 4 Reopens After Hazmat Scare