As North Korea intensifies testing of its ballistic missile technology, a U.S. website said Friday it also sees further signs from satellite imagery that North Korea is looking to produce more plutonium for nuclear weapons, according to AP. The website 38 North, which monitors sites in North Korea associated with its weapons programs, says an image taken Monday at the Nyongbyon nuclear facility shows a rail flatcar at a radiochemical laboratory complex where the North separates weapons-grade plutonium from waste from a nuclear reactor. Separating plutonium is one of two avenues North Korea has to produce fissile material for bombs.