Emergency services are present at Heathrow Airport because a fire alarm at the airport has been activated.
People have said on social media that airplanes can not start on Wednesday afternoon (July 18).
They say the tower had been evacuated; Surrey Live wait for confirmation from the airport.
A spokesman for Heathrow Airport said: "We are aware of the activation of a fire alarm at the airport and the emergency services respond to it, more information follows."
There are not many details at the moment, but we will keep you informed.
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