Search Engines Censoring Search Results About Dalian Protests

Here is nice summary from +Jonathan Watts of the Guardian of the protests on August 14 in Dalian demanding the relocation of a chemical plant - http://www.guardian.co.uk/environment/2011/aug/14/china-protest-against-px-chemical-plant

I've posted some screenshots of search results on several popular search engines in China for the phrase "Dalian PX" (大连PX) ["PX" is short for "paraxylene"]:

Sogou: "The keywords you input may relate to content that does not comply with relevant laws and regulations." (您输入的关键词可能涉及不符合相关法律法规的内容。)
Yahoo.cn: "Web pages that do not comply with relevant laws and regulations have already been filtered!" (已经过滤了不符合相关法律和法规的网页!)
Youdao: "Apologies, the content you searched for may not comply with relevant laws, and search results cannot be displayed." (抱歉,您搜索的内容有可能不符合相关法律,搜索结果将不能被显示。)
Baidu: "In accordance with relevant regulations and policies, a portion of search results have not been displayed." (根据相关法律法规和政策,部分搜索结果未予显示。) Search results are in fact limited to Xinhua, People's Daily, China Daily, China Central Television, and a few other websites operated by the central government.
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