GLASGOW A four-wheel-drive vehicle rammed into the main terminal at Glasgow airport on Saturday and exploded in flames, Glasgow police and witnesses said.
There were no immediate reports of injuries.
A Glasgow police spokeswoman said the vehicle had not penetrated the building and the blaze was under control.
Britain has been on alert after two cars packed with petrol, gas and nails were found in London's teeming theatre district on Friday. Anti-terror police said the car bombs could have killed or maimed scores of people.
A witness in Glasgow told Sky News that an Asian man who had been inside the vehicle scuffled with police immediately after the incident, was wrestled to the ground and detained.
Another witness said a second man, also Asian, was on fire following the blaze and badly burnt. The flames were extinguished and he was also detained by police, the witness said.
Another witness told the BBC that the vehicle was a Land Rover and that there was a heavy stench of petrol after the car crashed. He said he did not believe the vehicle was a car bomb, saying that the explosion was relatively small.
"There was chaos at the airport," James Edgar, another witness, told Sky News. "I was in the airport building trying to book a holiday. Suddenly people were running past us. Suddenly everyone said to get out of the airport."
BAA, which manages the airport, was not immediately available to comment.
Glasgow airport handles around 8.5 million passengers a year, according to its website, and would have been packed with holidaymakers at the time of the incident, which took place at around 3:20 British time, according to Glasgow police.