He added: “I knew his intention was to keep me back from the vehicle. He ran back to the vehicle and tried to open the back hatch of the Jeep Cherokee.
“I thought, ‘What is in the vehicle?’, because at that time I could hear popping and banging coming from the vehicle. By that time I was already sending out an emergency signal on my radio.
He said he realised that he was dealing with a terrorist attack when the second man who was on fire came towards him.
“It was hard to comprehend but I just had to accept the fact that terrorism had arrived at Glasgow airport,” he added.