Rare images have been released of North Korea's nuclear facility at Yongbyon, which is in the process of being disabled as part of an denuclearisation deal.
Pyongyang agreed to shut down the reactor and remove fuel rods in exchange for international aid and diplomatic concessions.
US researchers were given rare access to the facility in February, and were shown some of the equipment packaged for removal.
There are also by-products to remove, such as these bags of uranium trioxide.
The international community fears North Korea was using the plant as part of a secret weapons programme, something Pyongyang denies.
Observers from the International Atomic Energy Agency (IAEA) have closely monitored the denuclearisation process, and cameras have been installed to keep watch.
US officials say one quarter of the reactor's fuel rods have already been removed, with the rest due to be taken out by August.
While progress has definitely been made, the denuclearisation process has been far from smooth.
North Korea missed a year-end deadline for submitting full details of its nuclear programme, and has still not given enough information to satisfy the US.
But North Korean leader Kim Jong-il has insisted that his country remains committed to the international deal.