The emergency services were encrypted to the West London scene at around 4.15 pm at the airport of the tower was evacuated.
Heathrow Airport, the flight is delayed after a fire alarm in the short stopped arrival and departure.
Emergency services scrambled to the West London scene at around 4:15pm the airport and the tower was evacuated.
Air traffic has now resumed, but delays to departing flights are expected to continue until the late evening.
Some flights were diverted to Gatwick and Stansted, while others had to return to their take-off destinations.
Travelers stranded at the airport terminals expressed confusion on Twitter.
One wrote, “do not know what is going on, but waiting on the plane to Stockholm at #heathrow and the tower is evacuated. No planes take off.”
Others remained to wait on the tarmac, with one claiming the airport was at a “standstill”.
Great! Sitting in the plane as air traffic control evacuated because of a fire alarm 🚨 #Heathrow
— hiyatony (@tonykilsby) 18 July 2018
Another expect to fly to the airport of London of the present day, claimed that he and his fellow passengers were left “sitting on the asphalt.”
He wrote, “for Our flight back to LHR in Berlin Tegal airport is grounded and we sit on the tarmac.
“Pilot recommends a minimum of 2 hours of delay.”
One of the passengers appeared to be happy despite the disturbance.
Posting a photo of champagne that British Airways had offered her, Linda wrote on Twitter, “#Heathrow airport #runway fire alarm in the control tower!
#Heathrow airport #runway fire alarm in the control tower! Flights are going to be very delayed #BA look after us.
Special thanks to Bella🥂 pic.twitter.com/tofYFy66O8
— Linda (@LindaEVDriver) 18 July 2018
“Flights are going to be very delayed #BA look after us. Special thanks to Bella.”
A spokeswoman for Heathrow said: “We apologize for any inconvenience this has caused.
“Emergency services responded with the help of our regular safety procedures, and our activities started to resume.”
The spokeswoman added that the flights would be back to normal soon.
This article originally appeared on The Sun.