British Airways has warned of a security breach affecting its website and mobile app between 21 August and 5 September this year that, it says, resulted in the compromise of 380,000 customer credit card details.
In a statement last night, the company said that it was in the process of informing customers - but anyone who booked a flight direct with British Airways between those dates would be advised to cancel the cards that they used straightaway.
"We are investigating, as a matter of urgency, the theft of customer data from our website and our mobile app. The stolen data did not include travel or passport details," BA's statement claims.
It continues: "From 22:58 BST August 21 2018 until 21:45 BST September 5 2018 inclusive, the personal and financial details of customers making bookings on our website and app were compromised.
"The breach has been resolved and our website is working normally. We have notified the police and relevant authorities.
"We are deeply sorry for the disruption that this criminal activity has caused. We take the protection of our customers' data very seriously."
The airline has yet to confirm if affected customers will be compensated, but will be facing an investigation
"We take the protection of our customers' data seriously, and are very sorry for the concern that this criminal activity has caused. We will continue to keep our customers updated with the very latest information. We will be contacting customers and will manage any claims on an individual basis," it said in a statement.
The security breach is the latest in an increasingly long line of IT disasters affecting British Airways.
In 2015, its Executive Club frequent flyer system was hacked, spilling personal details, while last year a meltdown at one of its data centres grounded flights for several days.
Geoengineering on the sea floor near glaciers would form a new ice shelf to prevent melting
Alterations in capillary blood flow can be caused by body position change
Curiosity rover is in 'normal mode' but not transmitting scientific data back to base
NatWest outage comes a day after Barclays' IT systems shut out customers and staff