US on Iran nuclear deal: 'Important issues to resolve'
8 November 2013 Last updated at 15:01 GMT
Ministers of key world powers have gathered in Geneva to try to clinch an agreement on Iran's nuclear programme.
US Secretary of State John Kerry has interrupted the itinerary of his tour to the Middle East and North Africa to attend.
After arriving in Switzerland, Mr Kerry said the group was doing "important work" to "narrow differences".
He said important issues remained "unresolved".