Police suspect that the incident took place following a dispute over the collection of 'protection money' from persons working in the sex industry
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One suspect told police, 'I did not intend to kill'
Condition not considered life-threatening, police said
Suspects sought a fee for assistance with money-related problem, police said
Sumiyoshi-kai member solicited orders over the internet, police said
Inagawa-kai member suspected of participating in drug trafficking ring operated from 3 vehicles
Suspect allegedly beat the head of the victim over a 26-hour period while demanding a payment of ¥10 million
NPA said, 'Members are voluntarily leaving because it is difficult to fund operations'
Yamaguchi-gumi was taken to a hospital in Kohoku Ward where he was confirmed dead after undergoing a surgical procedure
Suspect's contact information had been distributed widely to attract customers, police said