FBI investigating source of WikiLeaks' purported CIA document dump

The FBI is investigating where the documents came from.

WikiLeaks published more than 8,000 pages of documents that it says are classified files from the CIA that purportedly reveal secrets about agency hacking tools used to break into computers, cellphones and smart TVs.

In a statement released earlier Wednesday, the CIA said it had "no comment on the authenticity of the documents."

The activities conducted by the CIA are subject to "rigorous oversight" to ensure that they comply fully with the law and U.S. Constitution, it said.

"The American public should be deeply troubled by any Wikileaks disclosure designed to damage the Intelligence Community’s ability to protect America against terrorists and other adversaries," the CIA said. "Such disclosures not only jeopardize US personnel and operations, but also equip our adversaries with tools and information to do us harm."

WikiLeaks said a former government contractor circulated the files, in a statement accompanying the documents.

ABC News' Pierre Thomas contributed to this report.