Reports of protest, violence emerged from North Korea after a drastic currency reform that sets an exchange rate of 1,000 old to 1 new . A North Korean paper in Japan confirmed the reform.
The report was not confirmed by South Korean intelligence sources, but it underlines the uncertainty surrounding the North Korean leader's eventual succession.
South Korea said Friday it had identified and blocked five IP addresses used to distribute computer viruses that caused a wave of Web site outages in the U.S. and South Korea.
'Dear Leader' Kim Jong Il has reportedly tapped his youngest son as his successor.
South Korea joined a US-led program to block shipments of nuclear material. In Japan, a lawmaker urged first-strike capability.
Monday's explosion – the latest in a series of hard-line moves by Pyongyang – may have been 20 times more powerful than its last test in 2006.
The move comes as South Korea and the US begin a large-scale joint military exercise.
The Yongbyon reactor could be operational again within a year.