An affiliate of scandal-hit mutual aid foundation KSD hired buses used at fundraising parties for Takao Koyama, an Upper House member arrested on suspicion of accepting bribes, sources close to the case said Friday.

The affiliate, Hoseiren, disbanded in November, spent some 4.8 million yen on chartered buses for Koyama's fundraising parties, which were held twice a year in 1996 and 1997, the sources said.

Another affiliate of KSD, KSD Tourist, arranged the charter of about 10 buses on each occasion. Hoseiren also paid about 600,000 yen to charter buses for another of Koyama's parties in January 1999.