The father of a five-year-old victim of the Dunblane massacre told how he was left "numb" by his daughters death as he joined a campaign for an enforceable global treaty to halt irresponsible arms trading.

Mick North, whose daughter Sophie was killed along with 15 of her classmates and their teacher at Dunblane Primary School in 1996, described the moment he was told his daughter was dead in a film made for Oxfam.

He is joined by David Grimason, whose two-year-old son Alistair was shot dead during a holiday in Turkey in 2003.

The pair helped Oxfam make a short film called Grieving Dads Demand Global Action, in support of the Control Arms campaign.

In the film, which will be promoted worldwide, the two men urge global leaders to agree a robust treaty which restricts the illegal or unlicensed movement of weapons.

Speaking in the film, Dr North said: "She was not just my daughter, she was my friend - even at five years old. Sophie's mum had died two-and-a-half years earlier so it was just the two of us and so I went home to an empty house. I was just numb."

David Grimason's son was asleep in his pram in a Turkish cafe when he was caught in the crossfire after a man pulled out a gun and started shooting.

Mr Grimason said: "I think about Alistair every day. I think about what he would be doing, what age he would be, what school he would be going to.

"Alistair was two-and-a-half-years-old. He was enjoying his life, having a lot of fun on holiday, playing in the sea, playing in the sand. He had that taken away from him."

Both men have travelled with Oxfam to see the damage caused in other parts of the world by the uncontrolled movement of weapons. Dr North visited Uganda and Mr Grimason visited Kenya.

Flouting embargoes

Research by the charity suggests that, since 2000, around £1.4bn-worth of weapons and ammunition have been sold to countries which have arms embargoes against them.

Its report, The Devil is in the Detail, shows the extent to which states and arms companies have been flouting the 26 UN, regional or multilateral arms embargoes in force during this period.

Oxfam wants the "international community" to end decades of irresponsible arms deals which devastate people's lives by agreeing to legally binding laws when diplomats meet to draw up a new arms trade treaty in July.

Judith Robertson, head of Oxfam Scotland, said: "We are hugely grateful to both Mick North and David Grimason for agreeing to recount their experiences to help boost public support around the world for a strong treaty.

"We are on the brink of a historic moment but the challenge is to ensure the new treaty is really strong. It must unambiguously stop arms transfers where they would fuel conflict, poverty or human rights abuses.

"Existing arms embargoes are far too easy to break or ignore. The lack of international regulation means states under embargo have been importing whatever weapons they choose with impunity.

"The new arms trade treaty must be robust enough to have a genuine impact on the lives of tens of thousands of innocent civilians suffering from armed violence every single day. This is the chance of a generation to truly make a difference.

"Our position is clear: a weak treaty would be worse than no treaty at all as this would merely legitimise the existing flawed system. We are urging Scottish people to back the campaign and sign up to show their support and give a voice to the victims of armed violence."