Ichiro Ozawa, secretary general of the ruling Democratic Party of Japan, faced fresh allegations of illegal donations Thursday after a source connected with an engineering firm told prosecutors that unreported contributions had been made to one of his aides when the contractor sought to get in on an Iwate Prefecture dam project.

During questioning by prosecutors, the source, who is connected with Mizutani Construction Co., based in Kuwana, Mie Prefecture, said ¥100 million in cash was given to Ozawa's secretary between 2004 and 2005. Others also backed up this allegation.

Political fund reports for 2004 and 2005 submitted by an Ozawa-related political group contain no reference to the cash.