On 21 July 1976 the British Ambassador to Ireland Christopher Ewart-Biggs was assassinated.
Mr Ewart-Biggs was murdered by a bomb planted in Sandyford which blew a huge crater in the road. Fellow passenger civil servant Judith Cooke was also killed in the explosion.
A hunt for the killers began with a complete search of the area where the explosion occurred, as well as house-to-house calls and road blocks.
This footage from RTÉ News shows Gardaí raking through fields and ditches in search of evidence or clues that could lead to finding those responsible for the attack.
Chistopher Ewart-Biggs had been appointed to the position as British Ambassador to Ireland just twelve days before his death.
Speaking about the assassination the Taoiseach Liam Cosgrave stated,
The government are determined that all resources at their disposal will be used to ensure that the perpetrators are brought to justice and face the full rigours of the law.
This footage was part of an RTÉ News report broadcast on 22 July 1976.