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“[The authorities] had been intensively cracking down on people for watching South Korean movies and distributing foreign media.
“At the scene of the crackdown on the dance instructor that day, a USB flash drive containing foreign songs and dance videos had been plugged in, next to the flat screen TV.
“Teenage students were learning how to dance by imitating the choreography on screen.
"The Anti-Socialism Inspection Group seized the flash drive and took the instructor and all of the students to their headquarters."
The source said authorities relaxed enforcements around Seollal - the Lunar New Year holiday - but the Anti-Socialism Inspection group reportedly ramped up activities in December.
Another source told the outlet that he had heard the instructor was running a private dance school out of her home after struggling to pay bills on a teacher's salary.
He claimed students could attend private lessons for one or two hours twice a week.
"They preferred to learn to dance like they do in South Korea, China and America, rather than in the North Korean style. So, she taught them how," he said.
It is alleged officers from the Anti-Socialism Inspection Group watched the dance instructor's home in plain clothes before raiding the house.
A third source claimed most of the children are from wealthy families.
They said: “Since the Central Committee has ordered that those who violate the Elimination of Reactionary Thought and Culture Act be severely punished regardless of their rank or class, the foreign dance instructor and students caught this time will not be spared from hard labour.
"Their parents are also likely to be punished by being forced to leave the party."
North Korea's most popular all-female group Moranbong Band was formed by leader Kim Jong Un Credit: AFP