The ex-girlfriend of North Korean leader Kim Jong-un was among several performers put to death on pornography allegations, a South Korean newspaper said.

South Korean newspaper Chosn Ilbo reported that Hyon Song-wol and other performers were put to death by firing squad.

They were accused of selling sex tapes of themselves and some of them allegedly possessed bibles, which is a political crime in the repressive state.

File footage from North Korea's state TV showed a woman believed to be Hyon standing behind Kim Jong-un and his wife at a concert in July 2012.

The South Korean newspaper said Kim and Hyon met about 10 years ago, but his father, Kim Jong-il, disapproved of their relationship and ordered it to end.

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