Cyber experts report ‘chasing ghosts’ after US warning

The first page of the Joint Analysis Report narrative by the Department of Homeland Security and federal Bureau of Investigation and released on Dec. 29, 2016, is photographed in Washington, Jan. 6, 2017. Computer security specialists say the technical details in the narrative that the U.S. said would show whether computers had been infiltrated by Russian intelligence services were poorly done and potentially dangerous.