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Kyodo News via AP

A protester holds aloft a banner that shows freedom of speech near the headquarters of Southern Weekly newspaper in Guangzhou, Guangdong province on Monday., Jan. 7, 2013. A dispute over censorship at the Chinese newspaper known for its edgy reporting became a political challenge for China's new leadership as protesters called for democratic reforms.

By NBC News staff and wire services

GUANGZHOU, China -- Scores of supporters of one of China's most liberal newspapers demonstrated outside its headquarters on Monday in a rare protest against censorship, backing an unusual strike by journalists against interference by the provincial propaganda chief.

The protest in Guangzhou, capital of southern Guangdong province, came amid an escalating standoff between the government and the people over press freedom. It is also an early test of Communist Party Chief Xi Jinping's commitment to reform.

Negotiations between journalists and officials, whom the protesters held responsible for replacing a New Year's letter to readers that called for a constitutional government with another piece lauding the party's achievements, continued into the night, a senior journalist who asked not to be named told NBC News.

Police allowed the demonstration outside the headquarters of the Southern Group, illustrating that the Guangdong government, led by new appointee and rising political star Hu Chunhua, wants to tread carefully to contain rising public anger over censorship.

The protesters, most of them young, laid down small handwritten signs that said "freedom of expression is not a crime" and "Chinese people want freedom."

China Nobel winner Mo Yan likens censorship to airport security

Many clutched yellow chrysanthemums, symbolizing mourning the death of press freedom.

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Chinese protesters stage rare censorship demo