In a blog post, the hackers from groups called KibOrg and NLB shared screenshots of what appears to be an internal database belonging to Alfa-Bank and personal details of several Russian individuals as “confirmation” of the breach.

 The hackers say there are more than 30 million records within the database, including Russian customers’ names, birthdates, account numbers, and phone numbers.

A Ukrainian intelligence official has confirmed that Ukraine’s top counterintelligence agency, the SBU, helped the hacktivists breach Alfa-Bank.

The official did not share additional details about how the SBU participated or any further plans for sharing the stolen data—Ukrainian journalists from the cybersecurity website.

The hacktivists wrote in the blog post on their site that they would be sharing the data obtained from Alfa-Bank with investigative journalists. Alfa-Bank has not publicly responded to the news of the hack.