AUGUSTA (WGME) — MaineGeneral Medical Center has determined additional protected health information impacting some individuals may have been accessed in the cyber attack on its computer network last November.

Letters to those impacted are being sent Friday, explaining the stage of the investigation, and ways individuals can protect themselves, including access to free credit monitoring and identity restoration services MaineGeneral is offering to those receiving letters of notification.

On Nov. 13, 2015, MaineGeneral was notified by the FBI of the detection of certain data, believed to belong to MaineGeneral, on an external website not hosted by MaineGeneral and not accessible by the general public.

Upon being contacted by the FBI, MaineGeneral launched an internal investigation by its IT team and, on Nov. 18, 2015, MaineGeneral validated the data supplied by the FBI as MaineGeneral data.

MaineGeneral hired a highly respected cyber security forensics firm to supplement the internal investigation by its IT team. MaineGeneral continues to cooperate with the FBI.