Hackers in China have breached the computers of oil companies around the world, including some in America, the U.S. security firm McAfee Inc. confirmed Friday.

The report confirmed hackers stole sensitive information about operations, finances and oil fields.

According the security firm, "coordinated, covert and targeted" cyber-attacks began in November of 2009 in the U.S. McAfee did not give the name of the companies the Chinese hackers targeted.

"We have identified the tools, techniques, and network activities used in these continuing attacks - which we have dubbed Night Dragon - as originating primarily in China," said the report.
    
Experts say China is one of the leading nations for Internet crime. Google even closed its China-based search site last year after hackers attacked its e-mail service.