Iran and the P5+1 countries (Britain, China, France, Germany, Russia, and the United States) agreed to extend talks on Iran's nuclear program for four months.  The extension ends on November 24.  U.S. officials argued in favor of the extension, saying that progress had been made on the future of the Arak heavy water reactor and the Fordow enrichment plant.  Under the extension, Iran will receive access to an additional $2.8 billion in frozen assets, though oil sanctions will remain in place.  In exchange, Iran has agreed to dilute additional stocks of nuclear material or convert some into reactor fuel.  Restrictions on Iran's uranium enrichment work that were part of the original agreement will also remain in effect.