WASHINGTON — The Pentagon for the first time used its annual report on China to directly assert that Beijing's government and military have conducted computer-based attacks against the U.S., including efforts to steal information from federal agencies.

In a new report on the Chinese military, the Defense Department goes a small step further than it has gone in the past, when it said that cyber-attacks originated in China and may be linked to Beijing's use of civilian experts in clandestine attacks against American companies. But over the past year, U.S. government officials and private cyber-security experts have increasingly stepped up accusations that the Chinese government is directly involved in cyber espionage against the U.S.

In February, a U.S.-based cyber-security firm, Mandiant, issued a report accusing a secret Chinese military unit in Shanghai of years of cyber-attacks against more than 140 companies, a majority of them American.

The Pentagon report, released Monday, said that, "In 2012, numerous computer systems around the world, including those owned by the U.S. government, continued to be targeted for intrusions, some of which appear to be attributable directly to the Chinese government and military."

It said China is using its cyber capabilities to collect intelligence against U.S. diplomatic, economic and defense programs. And the report warned that the computer skills needed for such espionage is similar to those needed to conduct cyber-warfare.

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The new wording in the report continues an escalating effort by U.S. officials to call out the Chinese on the cyber-attacks and to press for a more open dialogue with Beijing on the problem.

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