Decades pass but nothing happens. And when families come together to fight for answers, they discover how key files are either missing or hidden from view.

Loyalist paramilitaries are quickly identified as the perpetrators. But the sophistication of the attack and the explosives used raise many questions, including for British Intelligence Officer Colin Wallace

As survivors and bereaved struggle with the impact of the bombings, attention turns to why Dublin and Monaghan were targeted.

An hour and a half after three bombs in Dublin, a fourth bomb explodes in Monaghan town. 50 years on, locals vividly recall what happened

Three no-warning car-bombs go off almost simultaneously in Dublin's city centre during evening rush hour. Survivors and bereaved remember what happened.

Ahead of the 50th anniversary of the bombings in Dublin and Monaghan, 'The Forgotten' retraces what happened that fateful day, from the scenes of devastation in Dublin and Monaghan to how the perpetrators planned and carried out the attacks. Episode 1 available Tuesday 7th May.