Shares of British Airways' parent company IAG fell around 4% as markets opened on Friday morning, hours after the airline said the credit card information of at least 380,000 customers had been "compromised" in a data theft.
The airline discovered on Wednesday that bookings made between August 21 and September 5 had been infiltrated in a "very sophisticated, malicious criminal" attack, BA Chairman and Chief Executive Alex Cruz said.
British Airways is communicating with affected customers and is advising any customers who believe they may have been affected by this incident to contact their banks or credit card providers and follow their recommended advice.
Police and authorities have already been notified as they are likely to have stolen information about the economic data of hundreds of thousands of travelers who have made an online booking in recent weeks.
The breach has been resolved and the BA website is up and running.
Some customers have complained of having to cancel cards as a result of the breach.
Will I have to get a new card?
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"We are deeply sorry for the disruption that this criminal activity has caused", the statement said.
She tweeted: "My bank... are experiencing extremely high call volumes due to this breach! They´re a shambles", he told the Daily Telegraph newspaper. "None was given", she told the Daily Telegraph.
He added that, "The moment that actual customer data had been compromised, that's when we began immediate communication to our customers".
Britain's National Crime Agency says it is investigating.
And in May 2017, British Airways suffered a major computer system failure triggered by a power supply issue near Heathrow which left 75,000 customers stranded.
BA announced last month that it will halt flights to Tehran in September, citing low profitability as the USA reimposes sanctions on Iran.