NHK Chairman Katsuto Momii offered an apology during a TV program Sunday over the recent spate of criminal cases involving employees of the public broadcaster.

Appearing on "Totteoki Sunday," Momii said he deeply regrets the incidents and takes his responsibilities seriously.

NHK recently revealed that a subsidiary, NHK Integrated Technology Inc., is at the center of a ¥200 million embezzlement case.

Its employees were involved in the misappropriation of funds and have since been fired, according to NHK.

NHK said all of its executive board members will voluntarily return part of their compensation to take responsibility for failing to properly supervise the subsidiary.

Separately, an NHK announcer was arrested in January for alleged possession of "dangerous drugs" — drugs containing chemical agents that cause hallucinations and have stimulant effects. Their possession and use are banned.