James Bullard, president of the St. Louis Federal Reserve Bank, gestures during an interview in New York, U.S., on Friday, Jan. 30, 2015.

"...totally appropriate, at some point later this year, for us to start gradually moving away" from near-zero rates.

Ghana’s President John Dramani Mahama delivers a speech in Berlin, Germany, January 19, 2015. Anadolu Agency/Getty Images

Less than half of Ghana's installed capacity has been available, causing chronic power outages.

Protesters clash with police in Chilpancingo, Guerrero State, Mexico, February 18, 2015. JESUS GUERRERO/AFP/Getty Images

The decision comes amid escalating security threats from the protest movement in Guerrero.

Samsung logo.

Fall in profits prompts smartphone maker to freeze wages for the first time in six years.

Sam Walsh, chief executive officer of Rio Tinto Group, poses for a photograph ahead of the company's full-year results announcement at the London Stock Exchange in London, U.K., on Thursday, Feb. 12, 2015.

Sam Walsh says it would have no value for shareholders and regulators would never allow it.

A general view taken on January 6, 2015 shows the Mellitah Oil and Gas terminal on the outskirts of Zwara in western Libya

The Sarir field, which pumps about two-thirds of the country's remaining output, had a power failure.

Federal Reserve Board Chairwoman Janet Yellen prepares to testify at the US Senate Banking, Housing and Urban Affairs Committee hearing on Capitol Hill in Washington, DC, February 24, 2015.

The Fed's chief said that while the U.S. economy was improving, the employment situation was still fragile.