Today marks 30 years since 16 children and their teacher, Gwen Mayor, died in a shooting at Dunblane Primary School.
It's the deadliest mass shooting in UK history.
A memorial service was held days after the massacre - attended by Queen Elizabeth II and her daughter, Princess Anne.
The tragedy led to tighter gun controls being introduced across the UK, after a public petition led by three women from the local area - known as the Snowdrop Campaign.
The Prime Minister says we must "never forget" the "horror" of Dunblane.
Speaking in Parliament, Prime Minister Sir Keir Starmer said:
"We must never forget the horror of Dunblane and we must never forget the young children and their teacher who did not come home from school.
The campaign that families fought to make this country a safer place is a lasting legacy, and we should be enormously grateful for their courage."
Speaking at Holyrood, First Minister John Swinney said:
"I, like everyone who lived through that moment, will never forget that day. On the same day as parents faced the unbearable loss of their children, my eldest son was born. I remember the preciousness of my son's birth and could not begin to imagine that day, or any day since, the sense of loss faced by those families. In the months that followed, grief-stricken parents and residents of Dunblane decided that they would not let such tragedies happen again.
They collected 750,000 signatures in their campaign to change UK gun laws. In November 1997, handguns became illegal in the United Kingdom. Scotland has not seen a mass shooting since. My thoughts, my prayers and my deepest condolences go out to everyone impacted by that terrible tragedy. My most heartfelt thanks go to all who took action to ensure that it might never happen again. To the community of Dunblane, they have demonstrated in the intervening years such strength and resilience to demonstrate the power of community, the power of solidarity, the power of love within Scotland, and they have the respect and the admiration of us all."
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