The files posted "appear to come largely from a single shared network drive" used by the Parks and Recreation Department, St. Paul Mayor Melvin Carter said on Monday evening.

The group behind the cyberattack on St. Paul has claimed to have posted online 43 gigabytes of data stolen from the city's systems, Mayor Melvin Carter said Monday evening. Ubah Ali explains the operation to increase security and to help employees whose information is now at risk.

A ransomware attack is what prompted St. Paul officials to proactively shut down the city's information systems more than two weeks ago. Mayor Melvin Carter confirmed on Sunday that the person or people behind the attack demanded a specific sum of money and threatened to release data, but the city did not pay the ransom.