Four new slides detailing more of the top-secret NSA program known as PRISM were released Saturday by The Washington Post.

The slides — given to the Post by former NSA contractor Edward Snowden — show more detail of the flow of information from private companies to the NSA, how the information was analyzed, and how many people were targeted by the PRISM program.

The new slides show more details of NSA's possible "direct access" into private companies servers — appearing to show surveillance gear installed on-site by the FBI.

The first slide shows the targeting process of an NSA analyst, with supervisor and FBI oversight to ensure that American citizens are not being targeted. On the second slide, a flow chart is shown, with private companies — such as Yahoo or Google — first providing data to the FBI, then on to the NSA or other agencies for processing upon request.

As Joe Pollicino points out at Engadget, live monitoring of voice, text, and instant messages — "[watching] your ideas form as you type" as Edward Snowden mentioned — is indeed possible.

From The Guardian:

The data is intercepted by the FBI's "Data Intercept Technology Unit", the new slides suggest. From there it can be analysed by the FBI itself, or can be passed to the CIA "upon request".

It also automatically passes to various monitoring sections within the . These include, the annotated slides suggest, databases where intercepted content and data is stored: Nucleon for voice, Pinwale for video, Mainway for call records and Marina for internet records.

Perhaps the most interesting slide is the fourth, which says there were 117,675 active surveillance targets in the Prism database, as of April 5.

The Prism program, first revealed on June 6, reportedly allows the NSA to gain access to a number of major internet companies, including Google, Facebook, and Skype.

All the companies named have strongly denied any involvement and James Clapper, the Director of National Intelligence, has stressed that the program is lawful.

The original four slides were first published on June 6. Snowden gave The Guardian and The Washington Post a presentation that included 41 slides, which has not yet been revealed in full.