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(Japanese)
Police raided four bars in Roppongi on Thursday, including Wall Street 2, on suspicion they were operating outside the terms of their licences. Eight individuals, including a Dutch national, were arrested. The police believe the bars were operating as after-hours nightclubs. Local ordinances in Tokyo place heavy restrictions on such clubs and crackdowns on late night clubs are also known nationwide. Police raided these clubs before, and warned the owners about illegal operations, but say that they failed to demonstrate compliance.
Source (Japanese)