Beijing - China on Thursday denied media reports that it was involved in an attack on the US power grid by computer hackers.

   "The intrusion doesn't exist at all," Foreign Ministry spokeswoman Jiang Yu said, denying any involvement by China in mapping or breaking into America's infrastructure.

   The US Wall Street Journal reported Wednesday that cyber-spies, believed to be from countries like China or Russia, repeatedly attempted to gain access to the US power grid to leave viruses which could disrupt the system.

   "The Chinese have attempted to map our infrastructure, such as the electrical grid," the paper quoted an unnamed intelligence official as saying. "So have the Russians."

   While the hackers caused no damage, the investigators believe the viruses could be triggered in case of a war.

   Pointing out that the White House also denied the report, Jiang said Beijing hoped "that the concerned media will prudently deal with some groundless remarks, especially those concerning accusations against China."