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US Secretary of State John Kerry leaves his hotel on the way to mass at the St. Stephen's Cathedral in Vienna, Austria July 12, 2015 where the Iran nuclear talks meetings are being held. World powers raced to clinch a landmark deal to prevent Iran acquiring a nuclear bomb, with a source close to the marathon talks saying an agreement was '98-percent' completed. AFP PHOTO / POOL / CARLOS BARRIA (Photo credit should read CARLOS BARRIA/AFP/Getty Images)
US Secretary of State John Kerry leaves his hotel on the way to mass at the St. Stephen's Cathedral in Vienna, Austria July 12, 2015 where the Iran nuclear talks meetings are being held. World powers raced to clinch a landmark deal to prevent Iran acquiring a nuclear bomb, with a source close to the marathon talks saying an agreement was '98-percent' completed. AFP PHOTO / POOL / CARLOS BARRIA (Photo credit should read CARLOS BARRIA/AFP/Getty Images)

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    Update on the Iran nuclear talks

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Update on the Iran nuclear talks

Christiane Amanpour gives Wolf Blitzer a live update from Vienna, where the Iran nuclear talks are ongoing. She says that a deal is unlikely to be made tonight.

Update on the Iran nuclear talks

Christiane Amanpour gives Wolf Blitzer a live update from Vienna, where the Iran nuclear talks are ongoing. She says that a deal is unlikely to be made tonight.