Budget airline easyJet has been the target of a "highly sophisticated" cyber attack, with more than 2,000 passenger credit cards placed at risk.
The airline said an investigation found that email addresses and the travel details of approximately 9million customers have been accessed by a third party fraudulent company.
The airline has closed off the unauthorised access, however it said personal details, including card details, may have been compromised.
In a statement, easyJet said that around 2,208 people have had their credit card details accessed. The company, which was unable to state when the incident occurred, said it has "taken action" to contact those whose card details were accessed.