The release of Glenn Greenwald's new book - titled 'No Place to Hide' - has brought several more Snowden leaks to light; with one of the bombshell allegations being that US National Security Agency (NSA) tampered with Cisco router before export.

New photos released recently suggest that the US government placed surveillance equipment inside routers prior to the export of the devices --- something which the US government has actually, for years, been accusing the Chinese companies for doing.

The new photos show an NSA team intercepting and bugging a Cisco router before sending the router to a customer who had been targeted for surveillance. The photos essentially implicate the NSA in planting "beacons" into servers, routers and other network gear prior to the export of these devices across the world.

A pair of photos featured in Greenwald's new book allegedly shows a Cisco router being intercepted by the NSA's Tailored Access Operations (TAO) unit, which apparently installed a kind of 'Trojan horse' into the hardware before exporting it.

About the tampering done by NSA, an unidentified NSA manager said that the operation carried out by the agency was among "some of the most productive" in TAO because it gave the agency the ability to "pre-position access points into hard target networks around the world."