OSAKA (Kyodo) Two Japan Post Service Co. officials under arrest for allegedly allowing companies to save on postal fees by sending direct mail using a discount for disabled people probably took advantage of lax management, investigators said Wednesday.

Mitsuo Yamamoto, 59, the manager of Japan Post Service's Shin-Osaka branch, and Satoshi Suzuki, 39, a Shin-Tokyo branch official, were arrested Tuesday on suspicion of breaking the postal law.

The move followed the arrest of officials from various companies, including Best Denki Co., and members of support groups for the disabled.