"I want to stress that the Chinese government firmly bans and cracks down on all forms of hacker attacks," Chinese Foreign Ministry spokesman, Hong Lei said, commenting on a report by a cyber security group FireEye that hackers allegedly spied on governments and business in India and Southeast Asia.
"Hacker attack is a problem faced by the international community. The international community should cooperate with it instead of making speculation and accusations against each other," he said.
"Such a sustained, planned development effort coupled with the (hacking) group's regional targets and mission, lead us to believe that this activity is state-sponsored - most likely the Chinese government," the cyber security group claimed.
"The attack is still ongoing," said Bryce Boland, chief technology officer for Asia Pacific at FireEye and co-author of the report.
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The servers which the attackers used were still operational, and that FireEye continued to see attacks against its customers, he said.
A similar report in 2011 by McAfee said the Chinese hackers targeted Asian governments and institutions, among other targets.