North Korean leader Kim Jong Il has traveled to China on a rare trip outside his country, a South Korean military intelligence official said in Seoul.
"We confirmed he went to China," the official said. "We don't know why."
Kim, who seldom travels abroad, last visited China in April 2004 for a summit with Chinese leaders. North Korea and China, both communist countries, have traditionally had close ties. Chinese President Hu Jintao visited North Korea in October.