US Secretary of State John Kerry threatened to walk away from nuclear talks with Iran as he signaled that diplomats won't conclude an agreement over the coming hours - another delay that this time could complicate American efforts to quickly implement any deal.
"We can't wait forever for the decision to be made. If the tough decisions don't get made, we are absolutely prepared to call an end to this process," he said
"We will not rush and we will not be rushed," he added.