LAUSANNE, Switzerland -- The United States, Iran and five other world powers say they've reached an understanding that will direct them toward achieving a comprehensive nuclear agreement within three months.
Reading out a joint statement, EU foreign policy chief Federica Mogherini says a "decisive step" has been achieved.
Secretary of State John Kerry tweeted there was a deal "to resolve major issues on nuclear program. Back to work soon on a final deal."
World powers, Iran reach framework for nuke deal by June 30
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