The Tokyo District Court found three former officials of the Defense Facilities Administration Agency guilty Monday of bid-rigging, including on construction assignments at U.S. bases in Japan, and sentenced the key player to prison.

Mamoru Ikezawa, 57, former technical councilor for the facilities agency, was sentenced to 1 1/2 years for violating a law that prohibits unfair bidding or auctioning through fraud or coercion.

Takayoshi Kawano, 58, Ikezawa's successor in the post, and Takashige Matsuda, 53, a former facilities inspection officer in the agency's general affairs department, received 1 1/2-year terms, but they were suspended for three years.