Troubles Incident in 1972

I am writing on behalf of my client, [Named Person] regarding an incident that involves his late father.
In 1972 his father, [Named Person], was driving to work on the Cullyhanna Road, Newtownhamilton when he was allegedly shot at by individuals lying in wait. His father was travelling to his place of employment in his vehicle and he was inside it when the shots were fired. My client seeks to know if there is any information that can be sought from the PSNI regarding the incident.