On the 17th of May 1974, a number of bombings took place in both Monaghan and Dublin.
3 bombs were set off in Dublin's city centre, and 1 in Monaghan town centre.
In all four cases, no warning was given.
A total of 34 people lost their lives on that day. 27 in Dublin, and 7 in Monaghan. Men, women, and children were among the deceased. An estimated further 300 were injured.
The Ulster Volunteer Force claimed responsibility for the bombings.