The Chinese government has slammed Google, claiming its filtering of pornography is too weak.

"The Google China website has not done the work to filter pornographic material in accordance with China's laws and regulations," the China Internet Illegal Information Reporting Center said.

The criticism follows an official campaign against online smut in China that has led to the shutdown of thousands of websites and warnings for many major internet portals. China also recently demanded that porn filtering software be included with all PCs sold in the country starting next month.

The Centre also called for Google to erase all vulgar content and said it had already found problems with Google's blocking of pornographic search results twice this year. The Centre then urged China's law enforcement to punish the company.

Google promised to step up control of its online search results in China. The company has always worked to monitor vulgar online content, including content harmful to children, it said.

Google was also attacked in news programs broadcast by state-run CCTV that showed Google searches returning links to porn.

Take part in PC Advisor's Broadband Survey 2009