'8 US telecom firms, many nations impacted by China hacking campaign'

Says White House as FBI, cyber agency issue guidelines to root out hackers

A top White House official on Wednesday said at least eight U.S. telecom firms and dozens of nations have been impacted by a Chinese hacking campaign.

Deputy national security adviser Anne Neuberger offered new details about the breadth of the sprawling Chinese hacking campaign that gave officials in Beijing access to private texts and phone conversations of an unknown number of Americans.