North Koreans have held celebrations after the country claimed it had conducted a nuclear weapons test.
People laid flowers and held ceremonial dances - on the 61st anniversary of the North's ruling Workers' Party.
The celebrations came in defiance of international condemnation over Pyongyang's announcement.
Tensions in the region have remained high since Monday. Soldiers on both sides of the Korean border have watched each other with caution.
But South Koreans made their anger public at the test that reportedly took place in Gilju in Hamgyong province.
Protesters in Seoul held aloft an effigy of North Korean leader Kim Jong Il bound to a missile.
Seoul has suspended part of its emergency aid to the North.
Only Russia has so far confirmed the test and many South Koreans pray it was a failure.
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