Updated

Diplomats say Iran and six powers have extended nuclear talks until Nov. 24 after realizing that differences were too big to reach a deal by the Sunday, the informal deadline.

The decision was expected, with much of Friday spent on debating not obstacles standing in the way of an agreement but how long the add-on talks should go on and other related details.

Two diplomats who divulged the development demanded anonymity because they were not authorized to talk publicly about the confidential negotiations.

The biggest obstacle is uranium enrichment, which can make both reactor fuel and the core of a nuclear warhead. Iran says it does not want such weapons but demands it be allowed to keep its present program. The United States and its Western allies want deep cuts.