Police investigating the disappearance of a vulnerable man seven years ago have arrested a 50-year-old man.
Mark Gourley, 36, from Carrickfergus, went missing on March 7 2009. He was last seen in the Burney's Lane area of Glengormley. His body has never been found.
The suspect was detained in the Carrickfergus area on Tuesday.
Last week two other men - aged 43 and 45 - were arrested by detectives investigating the suspected murder and subsequently released pending further inquiries.
PSNI Detective Inspector Darren McCartney appealed to anyone with information about Mr Gourley's disappearance to come forward.
"I believe there are people in these communities who have knowledge of what happened to Mark," he said.
"Today's police activity is proof that police are continuing to investigate what happened to him.
"Additionally, people may have heard rumours about what happened to Mark. I would appeal to them to share this information with police. If anyone has information about him, I would ask them to examine their conscience and come forward to police.
"Alternatively, information can be provided anonymously to the independent charity Crimestoppers by telephoning 0800 555 111."
A PSNI spokesman confirmed he was later released unconditionally.