McGuinness: Prison officer’s killers using ‘flag of political convenience’
The North’s deputy first minister implored anyone with knowledge of the murder to come forward to the PSNI or the Gardaí.
His comments came as a prominent dissident republican, Colin Duffy, and a second man were arrested in Lurgan, Co Armagh, just miles from where Mr Black, 52, was assassinated in a drive-by shooting on the M1 motorway on Thursday.