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Tokyo prosecutors said in a statement that they formally pressed charges against Tsuyoshi Kikukawa and two other former executives at the Tokyo-based medical-equipment maker, along with three other men from consulting companies who collaborated in the scandal.

The six men were arrested in mid-February on suspicion that they had falsified the company’s financial statements from 2006.

Prosecutors started a fresh investigation of the four former Olympus employees Wednesday over alleged additional falsification from 2008 to 2010.

Olympus has said it hid 117.7 billion yen ($1.5 billion) in investment losses dating to the 1990s.

The scandal surfaced late last year when then-President Michael Woodford raised questions about payments for financial advice and acquisitions of companies that were not related to Olympus’ mainstay operations.

Olympus initially denied any wrongdoing but later acknowledged the hiding of investment losses.

• From wire dispatches and staff reports