The Transport Ministry lodged a criminal accusation Friday with police against Mitsubishi Motors Corp. for allegedly concealing approximately 1,700 user complaints last year -- a scandal that prompted MMC President Katsuhiko Kawasoe the same day to announce his intention to step down.

The ministry believes MMC violated the Road Vehicles Law. It is the first time a criminal accusation has been filed against an automaker on suspicion of violating the law over recalls.

With the filing of the accusation, the Metropolitan Police Department is expected to launch a full-fledged investigation into longtime irregularities by the automaker.