A total of 20 people have been detained in China following the publication of a letter calling on President Xi Jinping to resign, Hiru news learns.
The letter was posted earlier this month on a state-backed website Wujie News.
Although quickly deleted by the authorities, a cached version can still be found online.
In most countries the contents of the letter would be run-of-the-mill political polemic.
"Dear Comrade Xi Jinping, we are loyal Communist Party members," it begins, and then cuts to the chase.
"We write this letter asking you to resign from all party and state leadership positions."
But in China, of course, and in particular on a website with official links, this kind of thing is unheard of and there have already been signs of a stern response by the authorities.
The detention of a prominent columnist, Jia Jia, was widely reported to be in connection with the letter, foreign media reports.