Children living near a south Wales village that was hit by a coal mining disaster 40 years ago have been remembering those who died.
On 21 October 1966, 116 children and 28 adults were killed when tonnes of coal waste from a mine slid down a hill and buried a school and several houses.
Newsround's Adam went to meet pupils at a school nearby where they have been learning about the disaster.
Amy, 11, said: "People think back on memories and how they lost family."
Abigail, 10, said it was really important to remember what happened: "It's really important because lots of mothers are still really sad about their children."
And Joseff, 10, said he wanted to find out more: "It's interesting for me - my grandfather helped rescue some of the kids from the school."
The landslide happened at 9.15am, just after pupils arrived at school at Pantglas Junior School.
When the coal tip collapsed, it sent a massive wall of mud and rock rumbling down the hill. The disaster struck after days of heavy rain.
Many people helped the rescue effort
Thousands of people came to help. Some tried to dig people out with their bare hands but very few survivors were found.
Most of those living in the village had a connection to mine and everyone living there was affected by the disaster.
A private service for will be held in Aberfan cemetery on Saturday.