North Korea on Friday vowed to retaliate if punitive UN sanctions are imposed for its latest nuclear test, and US officials said there are new signs Pyongyang may be planning more long-range missile launches.
With tensions rising, the communist nation punctuated its barrage of rhetoric with yet another short-range missile launch - the sixth this week.
Perhaps more significantly, officials in Washington said there are indications of increased activity at a site used to fire long-range missiles.
Officials said the initial analysis doesn't prove the North successfully completed an atomic reaction. At least one more test is coming.
South Korea's Yonhap news agency said the latest test launch was a surface-to-air missile designed to defend against aircraft or other missile attacks. It said the missile was believed to be a modified version of the Russian SA-5.