Carney's words echoed assertions one day earlier from Secretary of State John Kerry, who said the U.S. and five other world powers were in agreement, "but Iran couldn't take it at that particular moment, they weren't able to accept that particular thing."
That comment earned a stern response on Twitter from Iranian Foreign Minister Mohammed Javad Zarif.
"Mr. Secretary, was it Iran that gutted over half of U.S. draft Thursday night? And publicly commented against it Friday morning?" Zarif tweeted on Tuesday.
In an earlier tweet, after Kerry's news conference, the foreign minister wrote: "No amount of spinning can change what happened within 5+1 in Geneva from 6 p.m. Thursday to 5:45 p.m. Saturday. But it can further erode confidence."
Zarif appeared to be alluding to French officials, who surprised many by publicly raising concerns in the middle of the talks that proposed limits on Iran's ability to make nuclear fuel don't go far enough. France also sounded alarms over a planned heavy water reactor that would produce greater amounts of byproduct plutonium, which can be used in nuclear weapons production.
Western officials quickly tried to gloss over France's concerns and insisted the international coalition was united. Diplomats later started telling reporters that it was Iran who scuttled the deal because the six powers would not agree to formally recognize the Islamic republic's right to enrich uranium.
The U.S. and allies contend Iran is seeking a bomb, while Tehran says it wants to enrich uranium for energy and medical purposes.
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Follow Julie Pace at http://twitter.com/jpaceDC