A third person has been arrested in as many days over a loyalist gun attack in Co Down 30 years ago.
Former school teacher Peter McCormack, 42, was killed and three others were injured in the shooting at the Thierafurth Inn in Kilcoo on November 19 1992.
A 56-year-old man was arrested in the Belfast area on Thursday morning under the Terrorism Act.
He was taken to the Serious Crime Suite at Musgrave police station in the capital for questioning.
On Tuesday a 63-year-old man and a 58-year-old woman were arrested in the South Down area and questioned before being released.
The arrests came after police issued a fresh appeal for information last November about the attack, which was attributed to the loyalist paramilitary Ulster Volunteer Force.