Amphibious vehicles from the South Korean Marine Corps move at a village on Baegnyeong island near the western maritime border between the two Koreas, northwest of Seoul November 30, 2010. Secretive North Korea detailed for the first time its expanded nuclear programme on Tuesday, saying it had thousands of centrifuges as pressure built on China to rein in its ally amid heightened tensions on the peninsula. Nuclear-armed Pyongyang's revelations about its uranium enrichment came a week after it fired a barrage of artillery shells at Yeonpyeong island, killing four people including two civilians.