Kerry cites big gaps in nuclear talks with Iran, says extension of negotiations a possibility

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U.S. Secretary of State John Kerry says "very real gaps" persist between world powers and Iraq over the contours of a nuclear agreement as a Sunday deadline for a deal approaches.

Kerry is citing some progress after two days of nuclear talks with Iran and America's European partners in the Austrian capital of Vienna. But he says much work remains.

Kerry says he is returning to Washington on Tuesday to consult with President Barack Obama and Congress about the state of negotiations. He says he will also discuss the possibility of extending the talks past the deadline so negotiations can continue.