In the fictional `` Star Trek '' universe , the Dominion War is a conflict Hostile_encounter between the forces of the Dominion , Cardassian Union and , later , the Breen Confederacy against the Alpha Quadrant alliance of the United Federation of Planets , the Klingon Empire and , later , the Romulan Star Empire .

Breen and Buchanan were returning Arriving from an informal cross-border security conference Communication in Dundalk with senior Garda officers when Buchanan 's car – a red Vauxhall Cavalier — was flagged Action down and fired Use_firearm upon by six IRA gunmen Bearing_arms , who the policemen had taken Conquering for British soldiers .

Buchanan was killed Killing outright whilst Breen , suffering Bodily_harm gunshot wounds Bodily_harm , was deliberately shot Use_firearm in the back of the head after he had left Departing the car waving Motion a white handkerchief .

In the report Reporting Judge Peter Smithwick stated Statement that ‘ on balance of probability ’ , somebody inside the Dundalk Garda station had passed Giving on information to the IRA regarding the presence of Breen and Buchanan .