OSAKA -- Eight shareholders of Sogo Co. filed a lawsuit Friday against the former chairman of the collapsed department store chain and the company's auditor, seeking some 8 million yen to cover losses from the sharp drop in the firm's stock price.

The former chief has also been questioned by police over allegations that he tried to hide assets from creditors.

The eight shareholders, from Osaka, Chiba and Hiroshima prefectures, filed the suit with the Osaka District Court against Hiroo Mizushima, 89, and the Tokyo-based auditor Century Ota Showa & Co.