The Associated Press reports:

Negotiators at the Iran nuclear talks plan to announce on Monday that they have reached agreement on a historic deal capping nearly a decade of diplomacy that would curb the country's atomic program in return for sanctions relief, diplomats told The Associated Press on Sunday. The two diplomats said that a provisional agreement may be reached even earlier — by late Sunday. But they cautioned that final details of the pact were still being worked out and a formal agreement still awaits a review from the capitals of the seven nations at the talks. And senior U.S. and Iranian officials suggested that not enough time was left to reach a provisional deal by Sunday. All of the officials, who are at the talks, demanded anonymity because they weren't authorized to discuss the negotiations publicly.