VIENNA - US Secretary of State John Kerry said on Saturday there were still serious gaps in talks over Iran's nuclear program despite signs of some progress two days before a deadline to reach a deal between Tehran and major powers. '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.'
