Part of Glasgow Airport has been closed off due to a "police incident", with hundreds of passengers left in limbo.
Officials have yet to confirm what has happened, but witnesses say they believe a suspicious package has been found.
It has led to "wall to wall" queues as disgruntled customers hit out over a lack of information.
A Police Scotland spokesperson told The Mirror that the terminal building as been closed "as a precaution", but did not elaborate.
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@thatgeorg1na/Twitter)The force said: "Police and emergency services are currently in attendance at an ongoing incident at Glasgow Airport.
"The terminal building has been closed as a precaution, however, not evacuated. No further details available at this time."
SNP MP Ronnie Cowan complained that passengers were not being information about what was going on.
He tweeted: "Glasgow airport still appears to be closed. Fire brigades outside. No information being provided for passengers queuing outside."
Alexander Pugantsov, who is waiting for a flight, said there were long queues as a result.
He wrote: "Security shut because of a “police incident” at Glasgow Airport this morning.
"Not sure what’s happened but the queues are from wall to wall and not moving."
