Busy John Lennon Airport had to be partially evacuated - because of a busted scanner.
The security equipment malfunction meant passengers were asked to leave the departure lounge of the Liverpool airport.
A statement said: "Due to a technical problem with one of the airport's passenger scanning machines, all passengers have been removed from the departure lounge and are currently in the process of being rescreened.
"There is no threat to passenger safety."
A spokesman for Merseyside Police confirmed it was a "customer service issue" rather than a security alert.
It is not yet clear if flights have been impacted.