Pair Arrested Over Shooting Of Northern Ireland Police Officer

A teenager and a 37-year-old man have been arrested for the murder of a policeman in Northern Ireland.

Constable Stephen Carroll, 48, was shot in the back of the head when a gunman fired through the rear window of his unmarked patrol car.

Dissident republicans of the Continuity IRA have claimed responsibility.

Sinn Fein's Martin McGuinness branded the murderers "traitors to the island of Ireland".