Yonhap also reports that the North has set up a no-sail zone in an area off its east coast for the next week.
The news comes after South Korea proposed working-level talks with its communist neighbor earlier today. Seoul proposed a meeting to discuss how to prevent floods in the Imjin River, which runs through the two countries heavily armed border. The South also proposed a separate meeting of Red Cross officials to discuss reunions of families separated by the Korean War.
However, a government spokesman says Seoul has no plan to resume high-level dialogue with the North.