The bloomberg article I read (http://archive.is/j5wRd) presented it as evidence. Maybe other publications are doing the same.
>As part of the administration’s response, the FBI and Homeland Security Department also released a report with technical evidence intended to prove Russia’s military and civilian intelligence services were behind the hacking and to expose some of their most sensitive hacking infrastructure.
>As part of the administration’s response, the FBI and Homeland Security Department also released a report with technical evidence intended to prove Russia’s military and civilian intelligence services were behind the hacking and to expose some of their most sensitive hacking infrastructure.