The Securities and Exchange Surveillance Commission plans to file a criminal complaint against corporate extortionist Ryuichi Koike on suspicion that he demanded financial favors from Yamaichi Securities Co., investigation sources said August 1.

Prosecutors and the securities watchdog jointly raided the headquarters of the nation’s fourth largest brokerage this week, as well as the homes of its president and chairman, over its alleged questionable ties with the “sokaiya” extortionist, who is also at the center of the scandal involving Nomura Securities Co. and Dai-Ichi Kangyo Bank.

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