North Korea warns 'moment of explosion' nears
By Matt Smith, CNN
April 4, 2013 -- Updated 0254 GMT (1054 HKT)
(CNN) -- North Korea stirred up fresh unease in Northeast Asia early Thursday, threatening attacks by a "smaller, lighter and diversified" nuclear force and warning, "The moment of explosion is approaching fast."
The new threat came after the North Koreans locked South Korean workers out of a joint factory complex and announced plans to restart a nuclear reactor it shut down five years ago. Meanwhile, the United States announced it was sending ballistic missile defenses to Guam, a Pacific territory that's home to U.S. naval and air bases.
A South Korean soldier stands on a road linked to North Korea at a military checkpoint in Paju on Wednesday, April 3. After a week of threats to the United States and South Korea, North Korea blocked hundreds of South Korean workers from entering the industrial complex, which is an important symbol of cooperation between the two countries.