Prosecutors are set to build a bid-rigging case in connection with construction work on the Tokyo-Osaka maglev train line involving the nation's four major contractors, sources close to the matter said Wednesday.
The Tokyo District Public Prosecutors Office's special investigation squad is set to pursue the case in court against several officials who are suspected of violating antitrust regulations in a tender for construction work on a station in Tokyo.
As the investigation is coming to a final stage, prosecutors on Wednesday again questioned a former Taisei Corp. executive, they said.