U.S. not fully 'equipped' to detect foreign nuke threats: Pentagon

American intelligence and security agencies are not capable of detecting when foreign nations are building nuclear weapons, Pentagon has revealed.

A newly released Pentagon report that faults a range of U.S. agencies revealed that the nation is not yet organized or fully 'equipped' to detect clandestine nuclear activities across the globe.

According to the Washington Times, the report revealed that in most cases 'current solutions are either inadequate, or more often, do not exist'.

The report, which was compiled over three years by the Pentagon's Defense Science Board, said that more nations than ever are pursuing nuclear arms, however, the United States does not have the mechanisms to detect and track these programmes.

It added that U.S. intelligence agencies are also not doing enough to rectify the issue.

The United States "lacks a cohesive, long term, international engagement plan aimed at building cooperation and transparency," the report warned.