An unofficial US envoy visiting North Korea has warned that the situation on the peninsula is a "tinderbox".
The envoy, Bill Richardson, made the comments after talks with officials in Pyongyang, whom he asked to exercise "extreme restraint".
He said he had urged them to let South Korea go ahead with planned live-firing exercises on an island which was shelled by the North last month.
Pyongyang has been threatening to strike back if the drill goes ahead.
New Mexico Governor Bill Richardson is visiting Pyongyang in a private capacity, but he has in the past acted as a go-between with North Korea - with whom the US has no formal diplomatic ties.
He told CNN he had made "a little headway" in his talks with North Korean officials.
"I am urging them extreme restraint... Let's cool things down. No response. Let the exercises take place," he said.
"My sense from the North Koreans is they are trying to find ways to tamp this down. Maybe that will continue today, that's my hope," he said.
He suggested that the two sides consider holding a summit to seek ways of avoiding future confrontation.
"Right now this is a tinderbox. What we need to do right now is not just tamp things down, but look at steps that can be taken by the North Koreans, especially such as perhaps allowing the IAEA (International Atomic Energy Agency) to come in and look at the nuclear arsenal". BBC News
