Iran nuclear talks may be extended as US sees 'big gaps'

Credit: Reuters/Leonhard Foeger

U.S. Secretary of State John Kerry and German Foreign Minister Frank-Walter Steinmeier pose for photographers before a meeting in Vienna November 22, 2014.

'We're working hard,' Kerry said ahead of a meeting with German Foreign Minister Frank-Walter Steinmeier. 'We hope we're making careful progress, but we have big gaps, we still have some serious gaps, which we're working to close.'

(Reporting By Fredrik Dahl; editing by John Irish)