U.S. and North Korean officials met again on Friday, as six nations tried to reach a consensus that would enable them to produce a joint statement of principles on how to end North Korea's nuclear weapons programme, dpa reported. "They are working to get things down on paper," a U.S. official told Deutsche Presse-Agentur dpa after talks led by U.S. delegation head Christopher Hill and his North Korean counterpart Kim Kye Gwan. The U.S. official said he could not confirm the duration or details of the bilateral meeting on Friday, but he said he expected the six nations to continue talks on Saturday. The heads of the six delegations from the United States, North Korea, China, South Korea, Russia and Japan met for 30 minutes later on Friday, Chinese state media quoted a South Korean official as saying. The delegation heads agreed that talks would continue on Saturday, the government's Xinhua news agency quoted the official as saying. Before the talks on Friday, Hill said there were still key differences with North Korea but that "some of their ideas very much corresponded" to those of the United States. "I think when we start putting ideas down on paper, that means we enter a new phase, and we will have to see how successful that is," he said. --mor 1437 Local Time 1137 GMT