Eyewitness reports indicate this was no accident. "Blazing car crashes into airport," from the BBC:
A car on fire has been driven at the main terminal building at Glasgow Airport, police have confirmed.
Eyewitnesses have described a Jeep Cherokee being driven at speed towards the building with flames coming out from underneath.
They have also described seeing two Asian men, one of whom was on fire, who had been in the car.
Strathclyde Police said two people had been arrested and detained in connection with the incident.
The airport has been evacuated and all flights suspended following the incident at 1515 BST.
A Whitehall spokesman said the incident was not being treated as a national security threat however the prime minister is being kept informed of developments and is expected to chair a meeting of COBRA - the emergency committee later.
First Minister Alex Salmond has activated emergency procedures in response to the incident.
The incident comes a day after two cars were found containing explosives in central London.
The cars contained petrol, gas cylinders and nails but the devices did not detonate.
One eyewitness said: "I heard the sound of a car's wheels spinning and smoke coming out.
"I saw a Jeep Cherokee apparently as if it was trying to get right through the doors into the terminal building.
"There were flames coming out from underneath then some men appeared from in amongst the flames.
"The police ran over and the people started fighting with the police. I then heard what sounded like an explosion."
Eye-witness Richard Grey told BBC News 24: "A green Jeep was in the middle of the doorway burning.
"There was an Asian guy who was pulled out of the car by two police officers, who he was trying to fight off. They've got him on the ground.
"The car didn't actually explode. There were a few pops and bangs which presumably was the petrol."
Stephen Clarkson said he saw people running towards him and "panicking" then noticed a crashed Cherokee jeep.
He said he helped police restrain one of the men.
"It was lucky that I was there," he said.
"I managed to knock the man to the ground with my forearm and the police got on top of him and restrained him and put handcuffs on him."
Thomas Conroy, a maintenance worker at the airport believes the men deliberately tried to set the car on fire.
"It looked like they had molotov cocktails with them," he said.
"They sort of burst them round about the flames to make sure the car would go up big style.
"Within minutes it was up and the terminal caught as well."
Taxi driver Ian Crosby said: "This was no accident. This was a deliberate attack on Glasgow Airport."
UPDATE: Sky News reports that this is "being treated as a terrorist strike," and "armed police have now closed off Blackpool airport."