Caesars Entertainment Inc. alerted federal regulators Thursday that Caesars Rewards loyalty club members personal information was stolen in a cyberattack.

Caesars said in a filing to the U.S. Securities and Exchange Commission that it determined a copy of its Caesars Reward database was acquired that included the driver’s license numbers and/or Social Security numbers of many of its loyalty members.

Caesars says it’s still investigating to determine exactly what was obtained by the hacker.

Caesars said it has no evidence that any member passwords or personal identification numbers, bank account information or payment card information were stolen.

The parent company of Shelbyville’s Horseshoe Indianapolis Racing & Casino in Shelbyville says the cyberattack has been traced to an attack on an outsourced information technology vendor used by Caesars.

Bloomberg News reported Caesars paid millions of dollars to the group behind the attack to have the information deleted. But there is no guarantee of that taking place.

Caesars is offering credit monitoring and identity theft protection services to loyalty program members who enroll by calling 888-652-1580 between 8 a.m. and 8 p.m. on weekdays.

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