US Secretary of State John Kerry to leave Geneva for London on Sunday

GENEVA (AFP) - United States Secretary of State John Kerry will Sunday head to London from Geneva, where he is currently involved in talks with Iran over Teheran's nuclear programme, a spokesman said.

Mr Kerry will "travel to London on November 24" for talks with British Foreign Secretary William Hague and Libyan Prime Minister Ali Zeidan, Ms Jen Psaki said on Saturday.

Mr Kerry arrived in Switzerland on Saturday morning along with other foreign ministers amid growing hopes for a landmark nuclear deal between six world powers and Iran.

The ministers had made the trip after negotiators from both sides reported following three days of meetings that progress had been made towards reaching an accord.

Since their arrival, however, officials have indicated that there are still differences preventing the signing of a deal limiting Iran's nuclear programme in exchange for sanctions relief.

Mr Hague is also currently in Geneva along with foreign ministers from China, Russia, France and Germany.

News about Mr Kerry's departure coincided with comments from Teheran's lead negotiator Abbas Araqchi that the talks were "difficult" and that Iran was not sure that a deal would be reached on Saturday.