Kerry and Iran's Zarif resume nuclear talks unexpectedly
"Secretary Kerry is returning to Mandarin Hotel for another meeting with Foreign Minister Zarif," a senior State Department official said.
Reporters saw Kerry arrived back at the hotel, where the pair had earlier held five hours of talks on Wednesday, including an impromptu 15-minute walk along the Rhone River in central Geneva.
(Reporting by Arshad Mohammed and Stephanie Nebehay, Writing by Stephanie Nebehay; Editing by Alison Williams)