Executive Director Charles Kartman of the Korean Peninsula Energy Development Organization (KEDO) said Friday though no evidence confirms Pyongyang's possession of nuclear weapons, if they did have weapons, it would probably be no more than one.
The KEDO chief however quickly added this is only speculation and North Korea may have no weapons at all.
He went on to say, even if the communist state has enough plutonium to reprocess fuel rods, the country's technology enables to produce one or at best, two nuke weapons.
U.S. Democratic presidential nominee John Kerry had said in the Thursday TV debate with President Bush, that Pyongyang has some 4-7 weapons in its hands, attacking Bush for not holding bilateral talks with the communist North.