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Last year, Google Inc. closed its China-based search engine after complaining of cyberattacks from China against its e-mail service.

That case highlighted the difficulty of tracking hackers. Experts said that even if the Google attacks were traced to a computer in China, it would have to be examined in person to be sure it wasn’t hijacked by an attacker abroad. Beijing has yet to respond publicly to U.S. Secretary of State Hillary Rodham Clinton’s appeal last year for an investigation of the Google attacks.

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Associated Press Writer Annie Huang in Taipei and AP Business Writer Chris Kahn in New York contributed to this report.

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Online:

McAfee Inc.’s report: http://bit.ly/hvV38n