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SHANGHAI — An American cybersecurity company issued a report on Wednesday saying it had identified cyberattacks that lasted up to five years on a wide range of governments, American corporations and even United Nations groups.

The company, McAfee, said it had alerted the 72 targets it identified and also informed law enforcement agencies, which it said were investigating. The 14-page report calls the attacks highly sophisticated and says they appear to have been operated by a government body, which it declined to name.