The students were in their classroom when they heard a loud rumble. 

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Sources -  https://www.youtube.com/watch?v=zFz3ODVdvS4 https://www.bbc.co.uk/programmes/p04cb63l https://www.youtube.com/watch?v=lXqN559cPAY https://www.youtube.com/watch?v=WO68HoTiLp0&list=PLSqnt9WSSrKnvNOHADn16_FZObFFzPpc5&index=3 https://www.bbc.co.uk/news/resources/idt-150d11df-c541-44a9-9332-560a19828c47 https://www.dailymail.co.uk/news/article-3833303/The-mothers-bound-grief-50-years-Aberfan-haunting-stories-survivors-mothers-116-children-engulfed-coal-tip-solace-meeting-week-half-century.html https://aberfan.walesonline.co.uk/ https://www.bbc.com/news/uk-wales-45248269