Masaaki Shirakawa, the governor of the Bank of Japan, speaks before the press in Tokyo on Friday. The central bank announced new measures to stimulate the economy Tuesday. Rie Ishii/AFP/Getty Images hide caption

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This undated image shows the Amenas natural gas field in Algeria, where Islamist militants raided and took hostages last week. Dozens of hostages and their captors were killed when Algerian forces subsequently raided the facility. BP/AP hide caption

itoggle caption BP/AP