Inpex, Japan's biggest oil-exploration firm, says it is likely to suspend operations in Iran.

日本最大的石油出口公司Inpex称其可能悬置在伊朗的公司运作。

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The index's biggest fallers included oil group Inpex Holdings, down 5.3%, and Japan Energy owner Nippon Mining, falling 8%.

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Among energy plays, Woodside Petroleum gained 1.9% in Sydney, Inpex rose 1.6% in Tokyo and Cnooc climbed 1.1% in Hong Kong.

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According to the bank, staff leaked information about share sales involving energy firm Inpex, Mizuho Financial Group and Tokyo Electric Power in 2010.

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