CARTAGENA, Colombia - Talks in Istanbul on Saturday among negotiators from Iran and six world powers including the United States represented "a positive first step" in addressing international concern over the Iranian nuclear program, the White House said.

The parties in Turkey discussed Iran's nuclear program for the first time in more than a year and agreed to reconvene in Baghdad on May 23.

Ben Rhodes, deputy national security adviser, said the United States sees room to negotiate over how Iran can meet international obligations under its nuclear program, which Tehran says is for energy and medical purposes but global powers fear is meant to create a weapon.

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