UN Secretary General Ban Ki-moon has warned that the tensions between North and South Korea could become “uncontrollable”.
He said: "The current level of tension is very dangerous. A small incident caused by miscalculation or misjudgment may create an uncontrollable situation."
Speaking in Rome, he said he had urged North Korean authorities to refrain from "provocative rhetoric" and asked neighbouring countries to try to exert their influence on Pyongyang.
Through her tears, a North Korean woman told me how she had to escape: risk death while running across the border or die of starvation.
Memories of the Korean war are never far away in South Korea, where residents have grown used to living with the constant threat of war.
North Korea said it will withdraw workers from the Kaesong factory park run jointly with South Korea and suspend all operations there.