New CCTV footage has been released by detectives investigating the murder of west Belfast man Jim Donegan.
A dissident republican element is a main line of enquiry, police say.
One week on and police have made a fresh appeal for information following the brutal murder of the 43-year-old.
Jim Donegan was gunned down in front of schoolchildren and parents outside schools in West Belfast.
A 47 year old man arrested by detectives investigating the murder has been released unconditionally.
The chilling CCTV footage shows the suspect walking down the Glen Road before stopping outside Christian Brothers Secondary School.
He then walks across the pedestrian crossing in front of school children. He then shoots Jim and while fleeing from the scene, steps out in front of cars, holding his hand up, before jogging back along the Glen Road and into Clonelly Avenue, where he disappears.
Police spoke to parents as they arrived to pick up their children this afternoon (Wednesday) in an effort to obtain information about the lone gunman.
The victim was sitting in his red Porsche Panamera – registration JDZ 34 – waiting to pick up his 13-year-old son.
The gunman can be seen casually activating the pedestrian crossing lights before crossing the road and walking alongside school children seconds before firing his weapon eight times.
Detective Chief Inspector Pete Montgomery said he is keen to hear from anyone who has any information.
“Hundreds of children were pouring out of the three schools in the Glen Road area of West Belfast at the time – many of them witnessing the assassination of the father of two. Jim’s son was spared from this thankfully but only by a few seconds.
“Mums, dads, grandparents, young siblings and people in the community also saw the brutal slaying. The callous actions of the gunman will have catastrophic psychological effects on them all,” he said.
“Were you standing beside the gunman at the lights, were you driving one of the cars stopped at the pedestrian crossing as he walked across, were you the driver of one of the cars when he stepped out onto the road after he’d murdered Jim? If you were please get in touch with me or one of my detectives as you may have information which is vital for my investigation,” said Detective Chief Inspector Pete Montgomery.
The gunman was wearing a high visibility, hip-length yellow jacket, with ‘Security’ written on the back, dark bottoms, with a grey coloured hat or hood and he was carrying a black or dark bag over his shoulder.
Detective Chief Inspector Montgomery added: “Were you driving in the area and have dash-cam footage which could be of use to our investigation?
“I also want to speak to anyone who was in the area at the time, even if you did not witness the attack or see the gunman as I need to eliminate you from my enquiries,” he said.
Detective Chief Inspector Pete Montgomery said a dissident republican element is a main line of enquiry.
“I am appealing to the community to help identify who put the lives of countless children at risk and murdered Jim. It was utter madness to fire a gun so close to the school as any one of these bullets could have ricocheted and hit the children standing nearby.
“I need to remove this dangerous man from our streets. A man who thought it was acceptable to traumatise young children. Children who should be dreaming of presents and the magic of Christmas, who, are now, instead having nightmares.
“If you were in the area at the time did you see him disappear into a house or car in the Clonelly Avenue area?” he said.
Detective Chief Inspector Pete Montgomery said the murderous actions have left Jim’s family devastated.
“I would appeal to anyone with information to contact police on 101,” he added.