ALSO READ:North Korea test-fired missiles to simulate pre-emptive nuclear attack on South KoreaPakistan selling nuclear material to North Korea, China knows it: US sources North Korea's nuclear program is based on highly enriched uranium and plutonium separated from spent reactor fuel rods. Briefcase 1 Secret facility used by North Korea to enrich uranium for nuclear weapons. 3 Facility believed to be inside an aircraft part factory inside a mountain next to Panghyon Air Base. Confirming their location would be critical to the success of any future agreement to freeze and dismantle North Korea's nuclear weapons program, it said.

Source: India Today July 22, 2016 11:25 UTC