VIENNA, June 23 (Reuters) - U.S. bombing probably caused "very significant" damage to the underground areas of Iran's Fordow uranium enrichment plant dug into a mountain, though no one can yet tell the extent, U.N. nuclear watchdog chief Rafael Grossi said on Monday.
"Given the explosive payload utilised and the extreme(ly) vibration-sensitive nature of centrifuges, very significant damage is expected to have occurred," Grossi said in a statement to an emergency meeting of the International Atomic Energy Agency's 35-nation Board of Governors.