About 10,000 people are reported to have joined a group class action against easyJet after personal details of nine million customers were breached in a cyber attack.

The level of customers from more than 50 countries make it one of the UK’s biggest group-action personal data claims, the Financial Times reported.

Law firm PGMBM is leading the case against the budget carrier after filing papers last month.

The airline revealed in May that it was the victim of a cyberattack and its investigation revealed that the email addresses and travel details of around 9 million customers were accessed.

About 2,200 passengers had their credit card details stolen.

The airline said: “We are aware that a class-action law firm has filed a claim against easyJet in the High Court and that other firms are advertising their services to do the same.

“This is not uncommon and just because these firms are advertising does not mean they have a strong claim.”

Several thousand British Airways customers are also bringing a claim against the company over a hack in 2018 that put 500,000 customers’ data at risk. They were granted a group litigation order last year and are seeking to sign up more claimants.

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