Japan's competition regulator has filed criminal complaints against the advertising giant Dentsu and five other firms over the alleged bid-rigging of contracts for the Tokyo 2020 Olympics.
The regulator also filed complaints against seven unnamed individuals.
The announcement follows months of investigations into alleged corruption in the planning and sponsorship of Olympics and Paralympics events.
The Japan Fair Trade Commission says it had also filed complaints against advertising agencies Hakuhodo DY Holdings, Tokyo Agency, Fuji Creative Corporation, Cerespo and Same Two.
Dentsu, Cerespo and Fuji Creative have already been banned for nine months from bidding for contracts with Japan's industry, foreign and education ministries.