Iran and and six world powers have agreed on the outlines of an understanding that would open the path to a final phase of nuclear negotiations but are in a dispute over how much to make public, officials told The Associated Press Thursday.

The officials spoke outside week-long talks that have busted through a March 31 deadline in an effort to formulate a general statement of what has been accomplished and documents setting down what the sides need to do by the end of June deadline for a deal.

Swiss officials facilitating the negotiations set a news conference for later in the day that was expected to announce the results of the talks