The detention of Beijing-based video and photojournalist Du Bin, 41, is likely related to his work, said democracy activist Hu Jia, who said he's been a close friend of Du's for more than a decade. Du had recently completed a documentary exposing torture allegedly inflicted on detainees at a notorious labor camp in northeastern China as well as a 600-page book about the 1989 military crackdown on pro-democracy protesters in Beijing, published in Hong Kong.
"His work directly challenged the authorities. They are suppressing him to send a message to others," Hu said.
His detention comes amid a broader crackdown on China's small, beleaguered community of rights activists and dissidents launched under new Communist Party chief Xi Jinping. The campaign has dashed hopes that the new leadership might ease controls on civil society.
"I think that from a larger perspective, there has been no improvement in China's human rights situation since Xi Jinping took power, but in fact since the start of this year ... things have become even more conservative," Hu said.
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A woman who answered the phone at the You'anmen police station confirmed that Du's family had been briefed but said she could not provide details of his case to people who are not his family members. The woman refused to give her name.
Hu and Du Jirong said Du Bin was last heard from on May 31 and that his apartment was searched by police the next day.