Officials with the Japan Sumo Association questioned Harumafuji at the Ryogoku sumo arena in Tokyo on Sunday.

Harumafuji is accused of inflicting violence against Takanoiwa when they were dining out during a regional sumo tour last month. They are both from Mongolia.

Police have also questioned Harumafuji and are investigating the situation leading up to the assault.

Sources say Harumafuji admitted hitting Takanoiwa with his hands, but denied using a beer bottle.

The officials reportedly asked Harumafuji what happened before he hit Takanoiwa and how he reported the incident to his stablemaster.

Kagamiyama, a board member of the sumo association, spoke to reporters after the 2-hour session.

He declined to give details, only saying that Harumafuji had admitted assaulting the junior wrestler. He said the association will continue its investigation.

Kagamiyama also said he will interview the people who were drinking with the 2 wrestlers.