Detectives investigating a murder linked to the Provisional IRA have arrested a 60-year-old man.
The police assessment of IRA involvement in the killing of father-of-nine Kevin McGuigan in Belfast last week has raised the prospect of a political bid to oust Sinn Fein from Northern Ireland's power-sharing government.
The arrest is the eighth made by detectives so far. The suspect was detained in east Belfast and has been taken to the Police Service of Northern Ireland's (PSNI) serious crime suite for questioning.