OSAKA (Kyodo) Officials of Best Denki Co., printer Wellco Corp. and a support group for the disabled were arrested Thursday on suspicion of using a postal discount system reserved for the disabled to mail ads for the major electronics discount chain at a reduced rate.

Osaka prosecutors are expected to turn up other major firms involved in illicitly using the system to send more than 10 million pieces of direct mail.

Prosecutors Thursday raided the headquarters of Best Denki in Fukuoka Prefecture, the Tokyo sales department of Ishikawa Prefecture-based Wellco and other locations.