“Nucor Corp. recently identified a cybersecurity incident involving unauthorized third-party access to certain information technology systems used by the company. Upon detecting the incident, the company began promptly taking steps to contain and respond to the incident, including activating its incident response plan, proactively taking potentially affected systems off-line and implementing other containment, remediation, or recovery measures,” Nucor said in a statement. 

Nucor didn’t elaborate on the incident and didn’t say which facilities were affected. However, the company said it is restarting the affected operations and has notified federal law enforcement officials.