The president of a Tokyo construction firm has filed a criminal complaint against an employee of Mitsui Marine & Fire Insurance Co. and one of the insurer's former agents on suspicion of fraud, sources close to the case told Kyodo News on Monday.

Kamio Kensetsu's president, Shigeo Nakamura, filed the complaint with the Metropolitan Police Department, accusing the employee and the former agent of swindling 11 million yen the construction company paid between November 1993 and April 1997 for a "questionable" insurance policy, the sources said.

Mitsui Marine, Japan's third largest casualty and property insurer, sold questionable insurance policies worth more than 1 billion yen through 1997, despite instructions by the Finance Ministry not to do so. The incident came to light in July.