This is source I found from another site, main source you can find in last paragraph
The FBI has opened an investigation into the theft and posting of the alleged CIA documents released on the WikiLeaks website, reports CBS News’ Andres Triay.
U.S. intelligence sources say the data released by WikiLeaks Tuesday is being examined to determine the authenticity of the alleged leak, which contained thousands of documents purported to be CIA secret files detailing hacking tools the government uses to break into users’ computers, mobile phones and smart TVs.
Sources say there is an effort to sift through the data to see what is real. So far, the intelligence community is reacting to the data as if it is authentic and as if it’s yet another embarrassing security breach. Officially, the CIA says it has no comment on the authenticity of the documents. A CIA spokesperson did point out that the CIA is “legally prohibited from conducting electronic surveillance targeting individuals here at home, including our fellow Americans, and the CIA does not do so.”