Footage uncovered by the BBC's Spotlight programme shows the former Sinn Féin deputy first minister of Northern Ireland Martin McGuinness in the presence of republicans assembling a car bomb used in an attack in the centre of Londonderry in 1972.

The programme - Spotlight On The Troubles: A Secret History - also explores the rise of Ian Paisley, who went on become the Democratic Unionist Party (DUP) leader and first minister.

A former senior Army officer told the programme Mr Paisley "financed" a bombing by the Ulster Volunteer Force (UVF) in County Down in 1969.

The first episode of Spotlight On The Troubles: A Secret History will be broadcast on BBC One Northern Ireland and BBC Four on Tuesday 10 September at 20:30 BST.