A database breach at the popular U.K Racing Post site has exposed customers' personal data and caused trouble with site operations, the newspaper warns.

In a blog posted Monday, Racing Post states that "our site was the subject of a sophisticated, sustained and aggressive attack on Friday and Saturday, in which one of our databases was accessed and customer details were stolen."

The site, which enables customers to bet on horse and greyhound racing, said that no credit card information was hacked, nor were betting accounts, which are maintained by a third party.

However, the breached database contains user names, first and last names, "encrypted passwords," email and street addresses, and dates of birth, the site says.

Racing Post editor Bruce Millington said the publication believes the breach "may be part of a wider attack on a number of companies," though he offered no details on the nature or origin of the attack. The site has turned off its registration and log-in pages, but states that its racing information and betting pages are "completely safe to use."

The site suggests that all users change their passwords.

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