Passengers have described chaotic scenes at Heathrow airport this morning after a fire alarm alert sparked confusion.
Heathrow said the evacuation of Terminal One was due to "smoke from a vehicle fire" but passengers complained that they were not informed about the ongoing situation.
Jennifer Duhon tweeted: "How NOT to handle a fire alarm at world's largest airports.
"Heathrow staff have no idea where to send ALL arriving passengers at Term 1 Biggest mess ever. Unsafe and Unsettling."
The airport later said they were deploying more staff to reduce waiting times and apologised for the disruption.