UN inspectors investigating undeclared nuclear activity in Egypt that could be related to atomic weapons development are checking out a reprocessing lab for making plutonium, diplomats said. The lab, apparently put together in the 1980s but never used, raises questions about an Egyptian nuclear program which is peaceful but may also be carefully structured to be able to move toward weapons development if Cairo decided to take this step, diplomats said in recent comments. "It's not empty, the Egyptian story," a diplomat close to the UN's nuclear watchdog International Atomic Energy Agency told AFP, commenting on the ongoing investigation and hinting there are more undeclared activities than inspectors of the Vienna-based IAEA had originally thought. But the diplomat, who asked not to be named, said Egypt's undeclared work was small scale and not even comparable to South Korea, a non-atomic-weapons state which has admitted to carrying out small-scale rogue nuclear experiments. A second diplomat said the main question with Egypt is not what it is hiding but the range of its nuclear activities, in a country that is a regional power concerned about alleged nuclear weapons programs in Israel and Iran.