Teacher:In this task, you are given a text of many news articles seperated by special token "|||||". Your task is to summarize them.
Teacher: Now, understand the problem? Solve this instance: Grand champion sumo wrestler Harumafuji was involved in a drunken brawl late last month that left fellow Mongolian competitor Takanoiwa hospitalized with serious injuries, his stablemaster admitted to sumo administrators on Tuesday. 
  
 Stablemaster Isegahama’s comments were the first public acknowledgment of the incident. 
  
 According to a report in the tabloid Sponichi, Harumafuji was drinking with other Mongolian wrestlers on Oct. 26 after a regional tour in Tottori when the yokozuna, angered by Takanoiwa’s attitude, struck him with a beer bottle. 
  
 On Tuesday morning, Harumafuji, a nine-time tournament winner, was reluctant to address the report but later submitted paperwork to pull out of the ongoing Kyushu Grand Sumo Tournament, ending his current bid for a 10th career title. 
  
 “Regarding Takanoiwa’s injury, I sincerely apologize for causing trouble to his stablemaster, his stable, the Japan Sumo Association and my stablemaster,” Harumafuji said. “I cannot comment further until my stablemaster comes back.” 
  
 The Japan Sumo Association announced Monday that eighth-ranked maegashira Takanoiwa has been diagnosed with a concussion and a fractured skull, among other injuries, and revealed that he had been hospitalized from Nov. 5 to 9. 
  
 On Tuesday morning, JSA executives including chairman Hakkaku gathered at the Fukuoka Kokusai Center to confront Harumafuji and the two stablemasters. 
  
 The governing body said a crisis management team will investigate the case but will not hand down its ruling or punishment during the Kyushu tournament. 
  
 Meanwhile, Takanoiwa’s stablemaster Takanohana said he had earlier filed a police report in Tottori. 
  
 Takanoiwa, 27, was one of the early withdrawals from the Nov. 12-26 tournament. He is expected to miss the entire meet and be demoted to the lower juryo rank at the meet in January. 
  
 Both wrestlers are in sumo’s top makuuchi division. Since his debut at the New Year tournament in 2001, Harumafuji, 33, has won the championship nine times, his last title coming at the autumn meet in September when he competed as the only yokozuna while the other three withdrew due to injury. 
  
 In September 2012, Haramafuji earned a promotion to yokozuna, becoming the third consecutive Mongolian-born wrestler after Asashoryu and Hakuho to achieve the top rank. 
  
 Despite his bid for a second title this year, he lost his first two bouts in Fukuoka and will forfeit his scheduled third-day bout against top-ranked maegashira Tamawashi. ﻿﻿ His withdrawal from the meet is the eighth in his career. 
  
 Yokozuna Kakuryu withdrew earlier due to injury, leaving only two grand champions — Kisenosato and Hakuho — with 13 days remaining in the sellout tournament. 
  
 “He put on a strong performance to prove his worth as yokozuna in the last basho, so it’s disappointing that he has to pull out this way. It throws a wet blanket on an exciting tournament,” said former NHK announcer Kunihiro Sugiyama. 
  
 The incident has sent shock waves across the country, reminding fans that the ancient sport has yet to improve its reputation tainted by scandals over match-fixing, violence and bullying. 
  
 In 2010, Mongolian yokozuna Asashoryu retired from the sport following allegations that he attacked a man outside a Tokyo nightclub in the middle of the New Year tournament, though he did not directly comment on the drunken brawl. In June 2007, the police arrested stablemaster Tokitsukaze and three wrestlers who beat 17-year-old Tokitaizan to death using a beer bottle, a wooden stick and a metal bat. The junior wrestler, whose real name was Takashi Saito, died from shock due to trauma. ||||| The “veiled underbelly” of Japan’s national sport has been exposed, a newspaper has claimed, after one of the most senior wrestlers in its sacred sport of sumo was involved in a drunken brawl. 
  
 Harumafuji, a Mongolian wrestler, will likely be forced to resign due to growing public uproar over a bar fight in which another wrestler sustained a fractured skull. 
  
 Weighing in at 302 lbs, the 33-year-old was promoted to "yokozuna", the highest rank in the sport, in September 2012. But he is now the subject of a police investigation over the brutal incident and has withdrawn from the ongoing Grand Tournament in Fukuoka, southern Japan. 
  
 According to police, a fight broke out in a bar in Tottori where five Mongolian wrestlers were drinking in late October. It has been claimed that Harumafuji flew into a rage when Takanoiwa tried to answer his mobile phone while he was receiving a dressing down from his superior. 
  
 Harumafuji allegedly smashed a beer bottle over Takanoiwa's head and continued to punch him for between 20 and 30 times while he lay bleeding on a table before other wrestlers could intervene. 
  
 Takanoiwa, 27, was later diagnosed with a concussion, a fracture at the base of his skull and damage to his spine. He was in hospital for five days and also forced to pull out of the Fukuoka tournament, meaning that he will be demoted a rank. |||||
Student:
Going after a fellow sumo wrestler in the ring is quite all right. Outside the ring, and with a beer bottle, not so much. Hence why star athlete Harumafuji of Mongolia, one of only four active wrestlers to have achieved sumo's highest rank of grand champion, has thrown the sport into disarray after allegedly assaulting a fellow wrestler at a party late last month, reports the Telegraph. The 33-year-old had been drinking with fellow wrestlers in Tottori, Japan, when he reportedly began criticizing 27-year-old Takanoiwa's "poor attitude" and hit him over the head with a beer bottle "as punishment," Kyoto News reports, per the Guardian. The assault allegedly didn't end there. Apparently angered that his former opponent had tried to take a phone call during Harumafuji's criticism, the 300-pound wrestler is said to have unleashed 20 to 30 punches on Takanoiwa, who was hospitalized with a skull fracture, concussion, and spinal damage. Harumafuji—whose trainer admitted to Harumafuji's involvement, per the Japan Times—has apologized as a police investigation is underway. He also withdrew from a major tournament, but many believe his career is over. The scandal is just the latest to expose violence behind the scenes of sumo. In one of the more extreme cases, a trainer was jailed following the beating death of a wrestler in 2007.