Mark Simpson
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The scene of the 1989 NI police murders

An inquiry in Dublin has been hearing evidence linked to allegations that Irish police colluded with the IRA in the murders of two senior RUC officers in 1989.

Chief Superintendent Harry Breen and Superintendent Bob Buchanan were killed when their car was ambushed in South Armagh.

The BBC's Mark Simpson visited the scene of the ambush to explain what happened that day.