NHK said all of its executive board members will voluntarily return part of their compensation to take responsibility for failing to properly supervise a subsidiary at the center of a ¥200 million embezzlement case.

The public broadcaster said Tuesday that President Katsuto Momii will return 50 percent of his compensation for two months while five other executives will give back 30 percent for two months. Six others will also return 10 percent for two months.

"There was a problem with our internal controls and we hold ourselves responsible," Momii said in a statement of apology.

NHK has revealed that employees of the subsidiary, NHK Integrated Technology Inc., were involved in the misappropriation of funds and have since been fired.