Prosecutors on Thursday arrested two officials of the government-affiliated Japan Green Resources Agency and four employees of four contractors for allegedly rigging bids related to consulting work on forest road projects.

The move came after the Fair Trade Commission filed a criminal complaint with the Tokyo District Public Prosecutor's Office against the four contractors, who were awarded projects by Green Resources.

The officials arrested include Muneo Takagi, a 59-year-old executive director in charge of the forest project management department of Green Resources, based in Kawasaki, Kanagawa Prefecture.