The report in the Wall Street Journal quotes intelligence officials saying that cyber-spies last year repeatedly gained access to the system powering everything from financial institutions to sewage systems.
"The Chinese have attempted to map our infrastructure, such as the electrical grid," the daily said quoting an unidentified senior intelligence official, and "so have the Russians."
While no damage was caused, investigators found time bomb style viruses sown into the system. "If we go to war with them, they will try to turn them on," the official was quoted as saying.
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