According to a notification letter issued by Zoll – "On January 28, 2023, we detected unusual activity on our internal network, and we promptly took steps to mitigate the incident. We consulted with third-party cybersecurity experts to assist with our response to the incident, and we notified law enforcement. We determined that your information may have been affected on or about February 2, 2023. Our investigation into the incident is ongoing." Zoll informed the Maine Attorney General's 0ffice on March 10, 2023, that just over one million individuals were impacted by the breach.