The Tokyo Metropolitan Police have warned the head of a political group over inappropriate posters placed on a campaign board for the Tokyo gubernatorial election.
Investigators told NHK that 24 posters carrying the name of an adult entertainment shop had been found on an election poster board in Tokyo's Shibuya Ward.
The police reportedly warned the political group's leader on Saturday on suspicion of violating the law regulating advertisements of adult entertainment businesses.
Following the warning, the political group apparently replaced the posters.
The incident follows a similar case in which posters of an almost-naked young woman were displayed on campaign boards on Thursday, when campaigning for the gubernatorial election officially kicked off.
Tokyo police also warned the candidate responsible for those posters for violating the capital's regulations.
A record 56 candidates are competing in the race to choose Tokyo's next leader in the election on July 7.