A cyberattack on May 8 led Ascension, a healthcare nonprofit, to shut down some systems and advise partners to disconnect.

Ascension operates 140 hospitals and 40 senior living facilities across 19 states.

The organization has engaged Mandiant to assist with the cyberattack investigation and recovery efforts.

The nature of the cyberattack, such as whether it involved ransomware, remains unclear.

The attack follows a U.S. Department of Health and Human Services warning about IT help desk targeting in the healthcare sector.

Ascension has committed to informing individuals if their personal health information was breached.