This photograph of a boy in a gas mask holding a petrol bomb became a defining image of the Troubles in Northern Ireland.

The iconic picture was taken during the Londonderry Bogside riots in August 1969.

Fifty years on, photographer Clive Limpkin reflects on capturing that moment.

Read more here: What set Northern Ireland's Troubles alight?

Filmed and edited by: Davy McIlveen.

Produced by: Chrissie McGlinchey.