Diplomats: Iran announcement planned Monday

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VIENNA (AP) -- Negotiators at the Iran nuclear talks plan to announce Monday that they've reached a historic deal capping nearly a decade of diplomacy that would curb the country's atomic program in return for sanctions relief, two diplomats told The Associated Press on Sunday.

The envoys said 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. Once it is complete, a formal, final agreement would be open to review by officials in the capitals of Iran and the six world powers at the talks, they said.

Senior U.S. and Iranian officials suggested, however, there might not be enough time to reach a deal by the end of Sunday and that the drafting of documents could bleed into Monday.

All of the officials, who are at the talks in Vienna, demanded anonymity because they weren't authorized to discuss the negotiations publicly.

Photos from the Iran nuclear talks:

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Diplomats: Iran announcement planned Monday
US Secretary of State John Kerry organizes his papers during a hearing of the Senate Foreign Relations Committee on Capitol Hill July 23, 2015 in Washington, DC. US Secretary of State John Kerry, US Secretary of Energy Ernest Moniz and US Secretary of the Treasury Jacob Lew appeared before the committee to defend the Obama administrations proposed deal with Iran over the county's nuclear program. AFP PHOTO/BRENDAN SMIALOWSKI (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)
US Secretary of State John Kerry (L) sits next to British Foreign Secretary Philip Hammond as they attend a plenary session at the United Nations building in Vienna, Austria July 14, 2015. Iran and six major world powers reached a nuclear deal on Tuesday, capping more than a decade of on-off negotiations with an agreement that could potentially transform the Middle East, and which Israel called an 'historic surrender'. AFP PHOTO / POOL / CARLOS BARRIA (Photo credit should read CARLOS BARRIA/AFP/Getty Images)
Israeli Prime Minister Benjamin Netanyahu delivers a statement in his office in Jerusalem on July 14, 2015, after world powers reached a historic nuclear deal with Iran. Netanyahu said after the deal was reached that Israel was not bound by it and signalled he remained ready to order military action . AFP PHOTO / THOMAS COEX (Photo credit should read THOMAS COEX/AFP/Getty Images)
(From L to R) Chinese Foreign Minister Wang Yi, French Foreign Minister Laurent Fabius, German Foreign Minister Frank-Walter Steinmeier, European Union High Representative for Foreign Affairs and Security Policy Federica Mogherini, Iranian Foreign Minister Mohammad Javad Zarif, Head of the Iranian Atomic Energy Organization Ali Akbar Salehi, Russian Foreign Minister Sergey Lavrov, British Foreign Secretary Philip Hammond, US Secretary of State John Kerry and US Secretary of Energy Ernest Moniz pose for a group picture at the United Nations building in Vienna, Austria July 14, 2015. Iran and six major world powers reached a nuclear deal, capping more than a decade of on-off negotiations with an agreement that could potentially transform the Middle East, and which Israel called an 'historic surrender'. AFP PHOTO / POOL / JOE KLAMAR (Photo credit should read JOE KLAMAR/AFP/Getty Images)
German Minister for Foreign Affairs Frank-Walter Steinmeier (L) ,French Foreign Minister Laurent Fabius (3rd L), China's Foreign Minister Wang Yi (5th L), Federica Mogherini (C), High Representative of the European Union for Foreign Affairs and Security Policy, US Secretary of State John Kerry (3rd R), British Foreign Secretary Philip Hammond (2nd R) and Russian Foreign Minister Sergey Lavrov (R) sit around the table at the Palais Coburg Hotel where the Iran nuclear talks meetings are being held in Vienna, Austria on July 6, 2015. Foreign ministers from major powers began crunch talks in Vienna on Monday seeking to seal a historic nuclear deal to end a 13-year standoff, one day before a final deadline, officials said. AFP PHOTO / JOE KLAMAR (Photo credit should read JOE KLAMAR/AFP/Getty Images)
German Foreign Minister Frank-Walter Steinmeier (L), French Foreign Minister Laurent Fabius (3rd L) and Chinese Foreign Minister Wang Yi (R) sit around the table at the Palais Coburg Hotel where the Iran nuclear talks meetings are being held in Vienna, Austria on July 6, 2015. Foreign ministers from major powers began crunch talks in Vienna on Monday seeking to seal a historic nuclear deal to end a 13-year standoff, one day before a final deadline, officials said. AFP PHOTO / POOL / CARLOS BARRIA (Photo credit should read CARLOS BARRIA/AFP/Getty Images)
US Secretary of State John Kerry walks delivers a statement on Cuba outside the hotel where the Iran nuclear talks meetings are being held in Vienna, Austria, July 1, 2015. Talks between Iran and major powers towards a historic nuclear deal are facing tough issues but are making progress, US Secretary of State John Kerry said during a break from talks in Vienna. AFP PHOTO / CHRISTIAN BRUNA (Photo credit should read CHRISTIAN BRUNA/AFP/Getty Images)
US President Barack Obama gestures while making a statement at the White House in Washington, DC, on April 2, 2015 after a deal was reached on Iran's nuclear program. Iran and world powers agreed on the framework of a potentially historic deal aimed at curbing Tehran's nuclear drive after marathon talks in Switzerland. AFP PHOTO/ NICHOLAS KAMM (Photo credit should read NICHOLAS KAMM/AFP/Getty Images)
UNITED STATES - APRIL 14: Sen. Bob Corker, Senate Foreign Relations chairman, arrives for a briefing on Iran nuclear negotiations with Secretary of State John Kerry and President Obama's chief of staff Jack Lew in the Capitol on Tuesday, April 14, 2015. (Photo By Bill Clark/CQ Roll Call)
French Foreign Affairs Minister Laurent Fabius (R) listens on as US Secretary of State John Kerry speaks during a joint press conference on March 7, 2015 at the Foreign Affairs Minister in Paris. Kerry had flown into Paris just a couple of hours earlier in a bid to shore up European support for the proposed deal with Iran ahead of a March 31 deadline. AFP PHOTO /ERIC FEFERBERG (Photo credit should read ERIC FEFERBERG/AFP/Getty Images)
EU political director Helga Schmid (CL) seats next to Iran's deputy foreign minister Abbas Araqchi (R) at the opening of nuclear talks between Iran and Members of the P5+1 group on March 5, 2015 in Montreux. The so-called P5+1 group of Britain, China, France, Russia, the United States and Germany is trying to strike an accord that would prevent Tehran from developing a nuclear bomb. AFP PHOTO / FABRICE COFFRINI (Photo credit should read FABRICE COFFRINI/AFP/Getty Images)
WASHINGTON, DC - MARCH 03: Israeli Prime Minister Benjamin Netanyahu (3rd L) talks to U.S. Senate Majority Leader Sen. Mitch McConnell (R-KY) and Senate Majority Whip Sen. John Cornyn (R-TX) (L) as Senate Minority Leader Sen. Harry Reid (D-NV) (R) looks on during a photo-op prior to a meeting at the U.S. Capitol March 3, 2015 in Washington, DC. At the risk of further straining the relationship between Israel and the Obama Administration, Netanyahu addressed a joint meeting of the U.S. Congress warning congressional members against what he considers an ill-advised nuclear deal with Iran. (Photo by Alex Wong/Getty Images)
US Secretary of State John Kerry (R) is greeted by French Foreign Minister Fabius Laurent, on March 7, 2015, at the French Foreign Ministry in Paris. Flying in from London on the last stop of a week-long trip, Kerry will meet with the foreign ministers of France, Germany, and Britain to brief them on the status of the nuclear negotiations with Iran. AFP PHOTO/ERIC FEFERBERG (Photo credit should read ERIC FEFERBERG/AFP/Getty Images)
LAUSANNE, SWITZERLAND - MARCH 28: German Foreign Minister Frank-Walter Steinmeier arrives at Beau-Rivage Palace in Lausanne, Switzerland where he came for the nuclear talks with Iran on March 28, 2015. (Photo by Fatih Erel/Anadolu Agency/Getty Images)
LAUSANNE, SWITZERLAND - MARCH 28: German Foreign Minister Frank-Walter Steinmeier arrives at Beau-Rivage Palace in Lausanne, Switzerland where he came for the nuclear talks with Iran on March 28, 2015. (Photo by Fatih Erel/Anadolu Agency/Getty Images)
US Under Secretary for Political Affairs Wendy Sherman (L) and US Secretary of State John Kerry (2nd L) face French Director-General for Political and Security Affairs at the Ministry of Foreign Affairs, Nicolas de Riviere (2nd R), and French Foreign Minister Laurent Fabius (R) at the opening of a bilateral meetinh at Iran nuclear talks on March 28, 2015 in Lausanne. AFP PHOTO / FABRICE COFFRINI (Photo credit should read FABRICE COFFRINI/AFP/Getty Images)
The director-general for political and security affairs at the French Foreign Ministry, Nicolas de Riviere (2nd R), and French Foreign Minister Laurent Fabius (R) wait look on March 28, 2015 before a meeting at the Beau Rivage Palace Hotel March 28, 2015 in Lausanne. US Secretary of State John Kerry and Fabius met while in Switzerland for negotiations with Iran on its nuclear program.. AFP PHOTO / FABRICE COFFRINI (Photo credit should read FABRICE COFFRINI/AFP/Getty Images)
Iranian Foreign Minister Javad Zarif (C) takes a walk before meetings at the Beau Rivage Palace Hotel March 28, 2015 in Lausanne. Iranian officials are in Switzerland to continue negotiations on their nuclear program with other world powers. AFP PHOTO / POOL / BRENDAN SMIALOWSKI (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)
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"We are working hard, but a deal tonight is simply logistically impossible," the Iranian official said, noting that the agreement will run roughly 100 pages.

The senior U.S. official declined to speculate as to the timing of any agreement or announcement but said "major issues remain to be resolved."

Despite the caution, the negotiators appeared to be on the cusp of an agreement.

U.S. Secretary of State John Kerry, who on Thursday had threatened to walk away from the negotiations, said Sunday that "a few tough things" remain in the way but added "we're getting to some real decisions."

En route to Mass at Vienna's gothic St. Stephens Cathedral, Kerry said twice he was "hopeful" after a "very good meeting" Saturday with Iranian Foreign Minister Mohammad Javad Zarif, who had Muslim services Friday. The two met again early Saturday evening.

French Foreign Minister Laurent Fabius also was cautiously optimistic, telling reporters Sunday: "I hope that we are finally entering the last phase of this negotiation."

In Iran, President Hassan Rouhani said an agreement was close, but not quite done, describing the negotiations as "still steps away from reaching the intended peak."

In another sign that a deal could soon be sealed, Russian news agencies reported that Russian Foreign Minister Sergey Lavrov had arrived in Vienna. Chinese Foreign Minister Wang Yi was also expected later in the day. The other foreign ministers of the six nations negotiating with Iran already are in the Austrian capital and in position to join Kerry and Zarif for an announcement.

Movement toward a deal has been marked by years of tough negotiations. The pact is meant to impose long-term, verifiable limits on nuclear programs that Tehran could modify to produce weapons. Iran, in return, would get tens of billions of dollars in sanctions relief.

The current round of nuclear talks is now in its 16th day and has been extended three times since the first deadline of June 30 was missed. The mood among negotiators had turned more somber each time a new target date - first July 7, then July 10 and then July 13 - was set.

As the weekend approached, Kerry declared the talks couldn't go on indefinitely and warned that the U.S. could walk away from the negotiations.

Diplomats familiar with the talks said most of the nuts and bolts of implementing the deal have been agreed upon. But over the past week, issues that were previously on the back burner have led to new disputes. Among them is Iran's demand for a lifting of a U.N. arms embargo and its insistence that any U.N. Security Council resolution approving the nuclear deal be written in a way that stops describing Iran's nuclear activities as illegal.

A diplomat familiar with the negotiations said disagreements also persist on how long some of the restrictions on imports of nuclear technology and other embargos outlined in any new Security Council resolution will last. The diplomat, who demanded anonymity because the diplomat wasn't allowed to discuss the confidential talks, said restrictions will last for years, not months.

Meanwhile, Iranians were preparing to celebrate in the event of an agreement. Iran's semi-official ISNA news agency reported that deputy police chief Brigadier General Saeed Montazer al-Mahdi said the authorities are fully prepared for such celebrations.

Despite Kerry's relatively upbeat take, comments by Iran's supreme leader suggested that Tehran's mistrust of Washington would persist no matter what the outcome of the talks.

Iran's state-run Press TV cited Ayatollah Ali Khamenei on Saturday as calling the U.S. an "excellent example of arrogance." It said Khamenei told university students in Tehran to be "prepared to continue the struggle against arrogant powers."

His comments appeared to be a blow to U.S. hopes that an agreement will lead to improved bilateral relations that could translate into increased cooperation in a common cause- the fight against Islamic State radicals.

Zarif had hinted at just that last week, suggesting a deal acceptable to his country will open the door to joint efforts on that front.

Israeli Prime Minister Benjamin Netanyahu, a fierce opponent of what he considers a deal that is too lenient on Tehran, said Khamenei's comments showed that Western powers are "caving" in to Iran even as the Islamic republic keeps railing against them.

A nuclear deal will also face serious scrutiny from members of U.S. Congress.

"This is going to be a very hard sell for the administration," Senate Majority Leader Mitch McConnell, a Kentucky Republican, said on "Fox News Sunday" when asked about the likelihood of Congress signing off on a deal.

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