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https://stairnaheireann.net/2016/10/31/1973-mountjoy-prison-helicopter-escape-three-provisional-irish-republican-army-members-escape-from-mountjoy-prison-dublin-after-a-hijacked-helicopter-landed-in-the-exercise-yard-2/
1973 – Mountjoy Prison Helicopter Escape: Three Provisional Irish Republican Army members escape from Mountjoy Prison, Dublin after a hijacked helicopter landed in the exercise yard