The British police have arrested two more men in connection with Saturday's Glasgow Airport car bomb attack, the Strathclyde police have said.
The men were aged 28 and 25.
The police said the arrests of the men, who are not believed to be of Scottish origin, were as a result of intensive police operations in the Paisley area on Sunday night.
Strathclyde Assistant Chief Constable John Malcolm said: "This continues to be a fast-moving investigation and I am grateful to the public for their perseverance and support during these difficult times. I would continue to urge the people to be vigilant."