Aberfan. 21 October 1966. The day the children didn't come home from school: 60 years ago today, 116 pupils were buried side by side by a 30ft-mountain of slurry - their helpless parents reduced to clasping their hands through the rubble as they suffocated

Sixty years ago today, 144 people - most of them schoolchildren - were killed when a colliery spoil tip collapsed, triggering an avalanche of industrial waste to slide down into Aberfan, South Wales.