A large group of Iranian nuclear scientists and technicians has been spotted in the last few days at North Korea’s nuclear center at Yongbyon, according to debkafile‘s intelligence sources. American and South Korean watchers assumed at first they were examining the new, extra-fast centrifuges for enriching uranium North Korea had showed off to America visitors in November. But they thought again when a small group broke away from the Iranian delegation for a secret side-trip to visit North Korea’s Punggye-ri testing site near the Chinese border and appeared to be receiving detailed briefing on the next nuclear test planned soon by Pyongyang.