Finding a mob hangout in Tokyo requires little more than a telephone book. The city's richest crime group has an office tucked off the back streets of the Ginza shopping district. A brass nameplate on the door helpfully identifies the Sumiyoshi-kai, but the men inside are reluctant to discuss a potentially deadly split in the yakuza ranks.
The guy in the centre of the photo was killed a couple of days ago, so there will be a few revenge attempts. Usually visitors and civilians are unaffected, but they can be unlucky at times. I hope the police can arrest a few more, and help to calm things down.