A blazing jeep crashed into the main terminal building in Glasgow airport in Scotland on Saturday and a terror angle is not being ruled out with the incident coming a day after car bombing attempts were foiled in London.
A Strathclyde police spokeswoman said it was too early to say whether today's incident was terrorism-related.
Two people had been arrested in connection with the incident, media reports quoted police as saying.
Eyewitness said two Asian men drove a Cherokee Jeep at speed towards the building with flames coming out from underneath.
The two men - one believed to be on fire - staggered out of the jeep and became involved in a fight with passers-by and police.
The flames were put out with a fire extinguisher but smoke continued to billow out from the side of the airport. Passengers were cleared from the terminal building amid fears that this was a terrorist attack.
Holidaymaker Phil Jones told Sky News: "As I was coming out of the airport I saw a Jeep Cherokee which tried to drive into the main door.
"As I was coming out the Jeep was already on fire. Then there was a pop which I thought was the fuel tank."
BBC News executive Helen Boaden, who was at the airport, said she had spoken to a man who claimed to have witnessed what happened.
"What he says he saw is a Cherokee jeep drive into the glass frontage of the airport," she told BBC News 24.
"A man got out of it on fire -- he said there were actually two Asian-looking men but this guy was the one that was on fire".