There have been allegations of bribery in the Japanese Olympic Committee's (JOC) bid for the Games, of plagiarism in the initial design for the Games' logo, and of illegal overwork by dozens of companies involved in construction for the Games. Notable safety concerns for athletes have included radiation levels from the Fukushima Daiichi nuclear disaster, water quality, and expected heat levels. Political controversies include the use of maps showing disputed territories as part of Japan, and a refusal to ban the rising sun flag at Olympic venues.