Tokyo Electric Power Company Holdings (Tepco) said Thursday that its employees had recorded court proceedings of some civil cases related to the company in violation of the Rules of Civil Procedure.

On the same day, Shikoku Electric Power and Chugoku Electric Power also admitted to making audio recordings in the courtroom.

Among other regional power utilities, similar problems have already come to light at Chubu Electric Power, Hokuriku Electric Power, Kansai Electric Power and Kyushu Electric Power.

The remaining three ¡ª Hokkaido Electric Power, Tohoku Electric Power and Okinawa Electric Power ¡ª have not confirmed such misconduct.

According to Tepco, some employees have made audio recordings since at least around 2015. Some of them knew that it was problematic. They deleted the audio data after compiling internal reports. Tepco has not confirmed organizational involvement.

On Thursday, the company issued a statement promising to take thorough measures to prevent similar misconduct. It will punish the employees involved under its internal rules.

Shikoku Electric said that employees began recording court proceedings about 10 years ago but stopped doing so?about a year ago.

Chugoku Electric said that an employee made a recording in or after 2008.