A well-known entrepreneur, Hung Huang, said online that the actions of Mr. Tuo had “destroyed, overnight, all the credibility the country’s top leadership had labored to re-establish since the 18th Party Congress,” the November gathering in Beijing that was the climax of the leadership transition installing Xi Jinping as Communist Party chief. Mr. Xi, who is also scheduled to assume the nation’s presidency in March, has raised expectations that he might pursue a more open-minded approach to molding China’s economic and political models during his planned decade-long tenure.

But more recently, he has said China must respect its socialist roots, which appeared to be a move to placate conservatives in the party.

One journalist for Southern Weekend said Monday night that talks between the various parties had taken place that afternoon, but there were no results to announce. “The negotiations did not go well at all,” the journalist said in a telephone interview.

Signs had emerged earlier that central propaganda officials were moving to dismantle support for the protest. A fiery editorial by Global Times, a populist newspaper, attacked the rebels at Southern Weekend and essentially accused them of conspiring against the government. Xinhua, the state news agency, and other prominent news sites published the editorial online, apparently at the orders of propaganda officials.

“Propaganda is still on the old road,” said an editor at a party media organization.

But by Tuesday morning, the news portals run by large Internet companies like Sina and Sohu rather than by the state had posted disclaimers with the Global Times editorial, saying the opinions did not reflect those of the companies.

It was on the Internet where the campaign to support the beleaguered journalists was reaching full bloom. Bloggers with large readerships, Han Han and Li Chengpeng, urged defiance of press censorship, and calls spread on microblogs for more rallies outside the newspaper offices on Tuesday.