573 people staying at an industrial complex , north of the zone . 80 South Koreans not cleared to cross the border into South Korea Monday . They threatened to retaliate from South Korea if its satellite launch is intercepted . Eighty South Koreans had applied to cross the border into South Korea on Monday , Kim said , but had not been cleared to do so . In Korea , U.S. have held their annual joint military exercises .
573 people staying at an industrial complex , north of the zone . 80 South Koreans not cleared to cross the border into South Korea Monday . They threatened to retaliate from South Korea if its satellite launch is intercepted . In Korea , U.S. have held their annual joint military exercises .