South Korea has upped its alert level to 'vital threat' after reports that North Korea could carry out a missile test at any time.
It comes on the day President Obama meets with UN Secretary General Ban Ki-Moon to discuss the crisis, Daybreak's Richard Gaisford reports.
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.