A Chinese hotel group is investigating the possible leak of millions of customers’ records, which appear to be for sale on the internet.
An advert is offering the 140 gigabyte data trove in exchange for Bitcoin on a dark web forum.
Security experts believe the firm’s database may have been accidentally uploaded to the internet.
Huazhu Hotels told the BBC in a statement that it “called the police without any delay”.
Shanghai Police is investigating the potential breach.
Data breaches are nothing new for China, but the scale of customer data involved has led to international press attention for the hotel group.
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