Dramatic footage taken inside a packed British Airways plane engulfed in smoke captures passengers - including young families - panic and rush to flee.
Brits have expressed their terror after with its evacuation slide in Valencia, Spain .
Thick grey smoke filled the cabin suddenly ten minutes before the plane was supposed to land in the city on the Spanish coast.
Three people were rushed to hospital.
Lucy Brown, 46, exclusively told Mirror Online her four children were crying as passengers around her shouted: "Open the door, open the door. We want to get off."
The associate dean at London College of Communication said: "My kids were in tears. It became thick with smoke. There was a horrible smell. People were almost choking."
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"There were lots of families and little kids on board. One little girl didn't want to go down the slide and had to be helped down.
"It was scary. I am just thankful we and the rest of the passengers are off safe.
"had this happened half an hour earlier, it might be a different story."
Though British Airways staff on the plane which left Heathrow Airport this afternoon were "calm" during the drama, they struggled to open the emergency doors, Mrs Brown added.
Footage shows one air hostess on the internal communication device desperate to converse with a colleague.
Mrs Brown, of Stoke Newington, north-east London, said: "We were sat near an emergency exit actually. They were struggling to open the emergency doors because they were that stiff.
"Air hostesses were trying to communicate but you couldn't see anything.
"It happened suddenly. The plane was pretty full too, with lots of families and young children."
The passengers were taken inside a terminal after the landing.
And they remain there, waiting further communication about their luggage.
"There is not much communication," the mum-of-four said.
"We are still waiting to find out what happened.
"Some people are saying it might have been the air conditioning but we don't know, we are waiting.
"Thankfully though, there are no injuries it seems but it was scary."
A spokesman for British Airways said: "We can confirm that British Airways flight BA422 from Heathrow to Valencia has been involved in an incident today.
"The aircraft, an A321, has landed and all customers and crew have disembarked.
"British Airways teams are assisting customers who are in the airport terminal."
