The luxurious Marina Bay Sands (MBS) casino and resort in Singapore has revealed a data breach affecting 665,000 client personal information.

The statement claims that information belonging to MBS loyalty program members was accessed by an unauthorized person during the security issue, which was detected on October 20.

The business continued, “Investigations have since shown that an unidentified third party obtained customer data of approximately 665,000 non-casino rewards program members.”

The following categories of information are among those made public by the data breach:

First name, email address
Number on a mobile device
Number of phone
nation where one resides
Tier and membership number