https://www.bbc.co.uk/news/live/uk-england-beds-bucks-herts-67075159An eye witness told the PA news agency: "There were a couple of fire engines with a car ablaze on the upper floor of the car park at just after 9pm.
"A few minutes later most of the upper floor was alight, car alarms were going off with loud explosions from cars going up in flames.
"The speed in which the fire took hold was incredible."
All flights have been suspended at Luton Airport after a large fire on Tuesday evening
Terminal Car Park 2 suffered a "significant structural collapse", fire service says
Up to 1,200 vehicles may have been in the car park at the time
Flights have been suspended until 15:00 BST
Hundreds of people have been stranded at the airport
Fire service says the blaze appears to have been "accidental"
up until recent times I can't remember a mass blaze at a multi storey but this is the second in recent years and I think it is down to the fact that modern cars have a greater tendency to catch fire