(Sioux Falls, S.D.) -- One of the largest healthcare systems in the region has been targeted in an attempted cybersecurity incident, officials say. In a statement, Sanford Health President and CEO Bill Gassen says the healthcare system is "taking aggressive measures to contain the impact." The healthcare system says that no known patient, resident or employee personal or financial information has been compromised, and that the system is working with IT security experts. They have also notified federal authorities.