Two men have been arrested over the shooting of a prison officer on a motorway in County Armagh.
One of them is understood to be prominent republican Colin Duffy.
David Black was killed in what police are calling an ambush on the M1 motorway yesterday.
Speaking on his way into the North South Ministerial Council meeting in Armagh - the Taoiseach Enda Kenny said the gardai will be co-operating fully with the PSNI in helping to track down the killers:
Meanwhile, a DUP MP is calling for greater protection for prison officers in the North.
East Derry MP Gregory Campbell says that after the murder of Mr Black yesterday, he says there has to be an urgent review of security for prison officers.
And he says from information he has received he says there has been an increase in the number of threats to prison officers in recent weeks.........