Japanese Olympics minister joins calls for investigation as JOC boss ducks questions over Black Tidings contract.

SOUNDBITE: (Japanese) Tsuneaki Takeda, Japanese Olympic Committee President

"We looked into the content of this contract, but this is a confidential matter. So, I understand that I am not allowed to disclose the content without gaining approval from the counterpart (of the contract)."

SOUNDBITE: (Japanese) Japanese Olympics Minister Toshiaki Endo

"I understand there is a matter of confidentiality, but we would like for them (related parties) to investigate on this issue while considering this issue (of confidentiality) and to handle this in a way which could gain understanding from the people of Japan."