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British Airways has called in police after a massive cyber hack saw the personal and financial details of its customers stolen.
The airline admitted tonight it is investigating "as a matter of urgency" the theft of customer data from its website and mobile app.
BA said it was communicating with customers that had been affected and the chairman said they are "deeply sorry".
It advised anyone who believes they may have been affected to contact their banks or credit card providers and follow their advice.
They added that they have notified the police and all relevant authorities.
The stolen data did not include travel or passport details, the airline said.
It added that the breach has been resolved and the website is working normally.
In a statement, the airline said: "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 ba.com and the airline's app were compromised."
Alex Cruz, British Airways’ Chairman and Chief Executive said: "We are deeply sorry for the disruption that this criminal activity has caused.
"We take the protection of our customers’ data very seriously."
Concerned customers have been expressing their concern on social media after BA tweeted about the incident.
One said: "Not happy BA your security should be tighter."
Others have been asking for more clarifications and information.
Mick Walsh wrote: "Several people have asked if this only affects those who made bookings in that time or if it could also affect those with card details saved. Any chance you could respond?"
BA have been directing people to their website for further information.
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