By taking possession of the 8,000 spent fuel rods in late December 2002, the North could conceivably begin producing plutonium-based bombs in as little as six months -- by late June 2003. Commercial satellite images from Digital Globe depicted possible North Korean efforts to prepare for the reprocessing of spent fuel in order to extract plutonium. A pair of images acquired on 15 January 2003 and 28 January 2003 showed smoke coming from a coal fired steam plant as well as steam coming from the steam line connecting the steam plant to the plutonium reprocessing facility. The preponderance of evidence would suggest that by mid-2003 North Korea had completed reprocessing the spent fuel, and that North Korea's stockpile consisted of the two nuclear weapons it had prior to 2003, and an additional six nuclear weapons produced during 2003. The stockpile may have been depleted by one device tested in Pakistan in 1998.