Chinese people walk past the headquarters of Google China in Beijing, China, January 13, 2010. Googles threat to quit China over censorship and hacking intensified Sino-U.S. frictions on Wednesday (13 January 2010) as Washington said it had serious concerns and demanded an explanation from Beijing. China has not made any significant comment since Google, the worlds top search engine, said it would not abide by censorship and may shut its Chinese-language google.cn website because of attacks from China on human rights activists using its Gmail service and on dozens of companies. U.S. Commerce Secretary Gary Locke urged China to work with Google and other firms to ensure cyber security, calling the intrusion troubling to the U.S. government and American companies doing business in China.