Police said Wednesday they have launched a probe into sumo grand champion Harumafuji's alleged assault on fellow Mongolian competitor Takanoiwa in late October that left the victim with serious injuries.The investigation into the drunken brawl began after police received a damage report from the victim, who was hospitalized for five days. On Tuesday, Harumafuji offered an apology but did not elaborate on the incident.According to sources familiar with the situation, Harumafuji, a nine-time tournament winner, was drinking with a group of around 10 sumo wrestlers in late October during a regi…READ FULL ARTICLE