New Delhi: The UN Secretary General, Ban Ki-moon has formally announced the shut down of North Korea's nuclear reactor at Yongbyon. The facility produces material that can be turned into weapons-grade plutonium. “I am told the facility has in fact been shut down. This is welcome as former foreign minister of Republic of Korea and other parties to continue implement their commitments to realise the de-nuclearisation of the Korean Peninsula as soon as possible,” said Ban Ki Moon. The confirmation from the UN chief comes after North Korea shut down its Yonbyon nuclear reactor over the weekend. The closing down of this reactor is crucial as it put an end to North Korea's nuclear programme that culminated in a nuclear test last October. The move comes as a part of the America's six-nation disarmament deal with Pyongyong signed this February. In return, North Korea will receive $300 million in energy and financial aid.