SEOUL, South Korea — A South Korean advocate for democracy in North Korea claimed on Wednesday that he was tortured by Chinese state security agents during his three-month detention in China.
 
The man, Kim Young-hwan, 49, made the accusation at a news conference in Seoul after he and three other South Korean activists were expelled from China last week. The four were seized by agents from the Ministry of State Security in northeastern China on March 29.
 
“For the last two months of my detention, they persistently demanded two things as a condition for my release: I admit to violating the Chinese laws and I never talk about the abuse I had suffered in their hands when I returned home,” Mr. Kim said. “I rejected them.”
 
“Even when the Chinese security officials handed me over to the South Korean officials at the airport for my expulsion, I angrily demanded that they apologize for the torture and abuse,” he added.
 
Mr. Kim did not give details of the abuse he says he suffered, pending a formal complaint from the South Korean government to Beijing. But when a reporter asked him whether he suffered “physical abuse” and “sleep deprivation,” he said, “Yes, both.”
 
After interviewing Mr. Kim, the South Korean government asked Beijing on Monday to investigate his claim, officials at the Foreign Ministry in Seoul said. The ministry may take further action after receiving a response from China, they said.
 
Mr. Kim said his group did not break Chinese laws. It collected information on human rights in the North and helped North Korean refugees living in China, he said.
 
The arrests of the four South Koreans on charges of “endangering national security” received wide public attention in South Korea because of Mr. Kim’s background. As a leader of the student movement that helped force the South Korean military strongman Chun Doo-hwan to make democratic reforms in the 1980s, he was tortured and imprisoned by his own government.
 
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