About 30 investigators conducted a search of the headquarters of the Kobe Yamaguchi-gumi on Friday.
The investigators had arrested 3 members of a gang affiliated with the Kobe Yamaguchi-gumi on suspicion of extorting about 44,000 dollars from a businessman.
The raid followed an announcement late last month by some gangsters that they had separated from the Kobe Yamaguchi-gumi and launched a new organization.
Police are on the alert across the country, suspecting that the latest breakup could trigger more armed conflicts among rival gangsters.
Japan had seen a series of incidents between the 2 major yakuza groups, the Yamaguchi-gumi and the Kobe Yamaguchi-gumi.
Source and image: NHK