People across Britain fell quiet to mark 50 years since a pile of coal sludge collapsed onto a Welsh community, eliminating over 140 people in just one of the worst mining disasters of the country.

The influx of dirt killed 116 children and 28 adults.

Welsh First Minister Carwyn Jones said it was “a heartbreaking time within our background, and no one who learns concerning the tragedy could don’t be greatly moved by it.”

One minute’s stop happened Friday at 9:15 a.m., the precise instant tragedy struck.

Prince Charles is due introduce a plaque in memory of the patients and to meet with survivors.