Hackers stole Social Stability figures and driver’s license quantities from a “significant number” of loyalty method customers of Caesars Entertainment, the hospitality and casino giant reported Thursday.

The disclosure comes as a different large Las Vegas brand, MGM Resorts, is recovering from its individual obvious cyberattack in which guests on Monday documented currently being not able to make area rates and accessibility their rooms with their digital keys.

The pair of hacks has place a highlight on the laptop or computer defenses of the multibillion-greenback on line casino and hospitality company in Las Vegas, which are ripe targets for cybercriminals to extort.

Caesars Entertainment, which owns renowned lodge-casinos these as Caesars Palace, verified on September 7 that the hackers had stolen a duplicate of the buyer loyalty application databases, in a filing with the Securities and Trade Commission. The hackers broke into laptop or computer units through “a social engineering attack” on an IT assist contractor, in accordance to the submitting.

“We have taken methods to make certain that the stolen data is deleted by the unauthorized actor, even though we can not guarantee this consequence,” Caesars Entertainment stated. The organization did not right away answer to CNN’s inquiries as to what techniques have been taken and no matter if they involved paying a ransom.

For its element, MGM Resorts has regularly referred to a “cybersecurity issue” in describing the disruption to some of its laptop or computer techniques, but the incident has the hallmarks of a cyberattack.

“We keep on to perform diligently to take care of our cybersecurity concern although addressing individual visitor requires instantly,” MGM Resorts mentioned in a assertion on Thursday morning. The business claimed on Monday, when news of the incident broke, that it had shut down specific computer devices to shield its data.

MGM Resorts did not respond to a number of requests for comment from CNN this 7 days on how it was dealing with the clear hack.

An FBI spokesperson reported the bureau was investigating the cybersecurity incident at MGM Resorts but declined further more comment, citing an ongoing investigation.

It is unclear who specifically was dependable for the cyberattacks. But a cybercriminal team recognised in the marketplace as Scattered Spider has been concentrating on casinos and accommodations in the latest months, according to Mandiant Consulting, a Google-owned cybersecurity business.

Associates of the hacking group “may be a lot less skilled and younger” than quite a few of the set up cybercriminal gangs and condition-backed cyber-espionage groups, but “they are a severe menace to huge organizations in the United States,” mentioned Charles Carmakal, Mandiant Consulting’s main technological know-how officer.

Some of the associates of the team seem to be based mostly in the United States and the United Kingdom, according to Carmakal and other sources interviewed by CNN. Bloomberg Information reported on Wednesday that Scattered Spider was accountable for the pair of cyberattacks on Caesars Entertainment and MGM Resorts.

Studies that the hackers experienced made use of social-engineering tactics in which, for instance, they pose as an IT support worker to get entry to an corporation, elevated concerns for cybersecurity professionals.

“Most corporations target on email-centered threats in their technical instruments and protocols,” Rachel Tobac, CEO of SocialProof Safety, a social-engineering avoidance company, told CNN. “Many [organizations] are not yet equipped with the social engineering prevention protocols required to capture and halt a mobile phone-centered attacker in the act.”