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IDG News Service - The Chinese government is likely behind recent cyberattacks on U.S. government Web sites and on U.S. companies in an apparent effort to quash criticism of the government there, an expert on U.S. and Chinese relations said Wednesday.

There's no conclusive proof that recent attacks on Google and dozens of other U.S. companies are directed by the Chinese government, but logic would point to official Chinese involvement, said Larry Wortzel, a member of the U.S.-China Economic and Security Review Commission and a former U.S. Army counterintelligence officer.

Google complained in January that it and several other U.S. companies were victims of recent cyberattacks coming from inside China. It is "not clear" who ordered the attacks, but it appears the Chinese government was involved, said Wortzel, who has served in the U.S. embassy in China.

There is a group of skilled hackers in China that routinely attacks systems to spy on political dissidents, said Wortzel, speaking during a U.S. House of Representatives Foreign Affairs Committee hearing. Chinese government agencies and Communist Party organizations would be the likely recipients of information obtained by hackers, he said.

"I concede that I cannot prove this beyond a reasonable doubt in a court of law," Wortzel added. "There may be a group of patriotic hackers in China who just hate criticism of the Communist Party and would take such action. But I believe such persistent, systematic and sophisticated attacks, some of which have taken place in the United States, in China, in Germany and in the United Kingdom, most likely are state-directed."

Multiple efforts to reach the Chinese embassy in Washington, D.C., for comment by telephone Wednesday were met with busy signals. Information on the "contact us" page on the embassy's Web site has been deleted.

In addition to attacks on Google and other U.S. companies, attacks from inside China are targeting U.S. military, technical and scientific information, Wortzel said.

"Not all of this cyber-espionage may be government-controlled," he said. "There may be plenty of cyber-espionage entrepreneurs in China who operate outside government control that could be working on behalf of Chinese companies or the 54 state-run science and technology parks around the country."

But the U.S. Department of Justice is prosecuting several espionage cases involving defense and other U.S. technology being turned over to unidentified Chinese officials, Wortzel said. "Let us be candid," he said. "A logical person would conclude that some of this activity is directed by the Chinese government."

Several members of the House committee used the hearing to criticize the Chinese government's filtering of Web content or its tracking of online dissidents. Wednesday's hearing was the second in Congress this month on other countries' efforts to censor the Internet.