The arrested former vice president of Nishimatsu Construction Co. once headed a key department linked to two political organizations that provided questionable funds to a number of politicians from both the ruling and opposition camps, investigative sources said Thursday.

Keiji Fujimaki, 68, who was arrested Wednesday, headed the department, called the control headquarters, for about three years starting in June 2003, when he was appointed senior managing director in charge of the major contractor's overseas operations.

The two political groups, each headed by a retired Nishimatsu official, provided a total of ¥480 million in the form of donations and fundraising party tickets to politicians under instructions from Nishimatsu during 12 years through 2006, the sources said.