Sinn Fein could be excluded from the Northern Ireland Assembly after police said members of the Provisional IRA may have been involved in a murder last week.

Northern Ireland's first minister Peter Robinson says he'll hold talks with other parties on the possibility.

The republican party has rejected any suggestion the IRA had a role in the killing of Kevin McGuigan in Belfast.

Sky Correspondent David Blevins says the power-sharing government is facing a crisis.