North Korean singer Hyon Song-wol, known as the ex-girlfriend of the reclusive state's leader Kim Jong-un has reportedly been executed by a firing squad, a South Korean newspaper said on Thursday (August 29).

The Chosun Ilbo said Hyon was among other performers executed on August 20 for violating the country's laws against pornography.

The performers were accused of selling sex tapes showing themselves having sex and some of them allegedly possessed bibles, which is classified as a political crime in the North, the newspaper reported.

The newspaper said Kim and Hyon met about 10 years ago when they were single, but his father, Kim Jong-il, disapproved of their relationship and ordered for it to end.

File footage from North Korea's state-run television KRT showed a woman who is believed to be Hyon appearing at a concert in July of last year.

An unknown source quoted by Chosun Ilbo said the families of Hyon and the other people in the sex video were taken to a labour camp.

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