just in, brand-new satellite images showing north korea is expanding a key facility used to enrich uranium, the very fuel used in nuclear weapons. let's go straight to cnn national security correspondent alex marquardt. tell us about the pictures. >> reporter: experts believe that the pictures indicate that north korea plans to increase its weapons great nuclear material, according to the newberry institute which analyzed this pictures. what you are seeing on the screen is a steady expansion of a part of the nuclear research facility complex. now, an expert at middlebury who spoke with my colleague, zack owens, says this indicates that this plant could increase its