KRT, North Korea's state-run television station, showed thousands of Koreans with banners and posters featuring the faces of leader Kim Jong-un and his father, Kim Jong-il, standing in Kim Il-sung square.
They chanted, "Down with the U.S. aggressor" and "Let us bring down our sworn enemy -- U.S. imperialists."
The Korean war led to the creation of the demilitarized zone, which is now the most fortified front in the world.
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