The alleged cyber-weapons are said to include malware that targets Windows, Android, iOS, OSX and Linux computers as well as internet routers.

Some of the software is reported to have been developed in-house, but the UK's MI5 agency is said to have helped build a spyware attack for Samsung TVs.

A spokesman for the CIA would not confirm the details.

"We do not comment on the authenticity or content of purported intelligence documents," he said.
Image copyright Twitter
Image caption Whisteblower Edward Snowden has tweeted that the leak appears to be authentic

A spokesman for the UK Home Office was unable to comment.

Wikileaks said that its source had shared the details with it to prompt a debate into whether the CIA's hacking capabilities had exceeded its mandated powers.