South Korea`s state news agency reported that among the 15 were a forestry minister - executed in January for allegedly complaining about forestation plans - and four members of the Unhasu Orchestra who were put to death in March on charges of espionage.
Yonhap said Wednesday that the allegations were made by South Korea`s spy agency in a closed-door parliamentary session.
Lee Cheol-woo, a lawmaker of the ruling Saenuri Party, said the Unhasu members included the head of the orchestra - in which North Korean first lady Ri Sol-ju was once a singer.
Japanese media reported in 2013 that some members had been executed along with an art troupe for making pornography.
They alleged that the execution was designed to cover up Ri`s involvement.
In 2013, North Korea`s leader Kim Jong-un had his once-powerful uncle, Jang Song-thaek, executed on charges of treason.
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