The PSNI are questioning five people in connection with last week's murder of a man in Armagh.
A 35-year-old man arrested in Dungannon today became the fifth person to be questioned about the killing of Martin Conlon.
Police arrested two men, aged 30 and 36, from Armagh earlier today and were also questioning a 30-year-old woman and a youth who have been in custody since yesterday.
They have been examining several possible motives for the murder of Mr Conlon last week, including the possibility that the attack may have been homophobic.
They have also been checking whether he was the victim of a fall-out with former associates linked to the Real IRA.
The dead man was recently released from a four-year prison sentence in Portlaoise prison for training others in the use of firearms in Co Meath. He had been one of six men jailed in Dublin in March 2001 after pleading guilty to training people in the use of firearms.
Mr Conlon, 35, from Railway Street, Armagh, who was found unconscious at the side of Farnaloy Road, outside Keady, at around 6.30pm on November 7th.
He was taken to hospital where he later died from several gunshot wounds to his head.
His body was discovered close to the Madden estate outside Keady and about a mile-and-a-half from where his silver Volkswagen Passat car was later found burnt-out.
Sinn Féin Newry and Armagh MP Conor Murphy said the murder was unjustifiable, and he called on dissident republicans to end their violence.