The recent cyberattack against the major hospital chain CommonSpirit Health resulted in significant delays to patient care across the nation.

One of the largest hospital chains in the U.S. was hit with a suspected ransomware cyberattack this week, leading to delayed surgeries, hold ups in patient care and rescheduled doctor appointments across the country.

CommonSpirit Health, ranked as the fourth-largest health system in the country by Becker’s Hospital Review, said Tuesday that it had experienced “an IT security issue” that forced it to take certain systems offline.

While CommonSpirit declined to share specifics, a person familiar with its remediation efforts confirmed to NBC News that it had sustained a ransomware attack.

Read the full story at NBC News.