Chilling CCTV shows a gang of killers laughing and joking in a McDonald's restaurant just minutes after the fatal stabbing of a teenage boy.

Liam Hunt, 17, was brutally knifed four times and left to die in a pool of blood in an alleyway after being attacked by a group of young thugs on February 14 last year.

A court heard the youngster suffered a seven centimetre deep wound from being stabbed in the neck in St George's Street in Northampton and later died in hospital.

Detectives cordoned off a McDonald's in Northampton after the attack as they questioned witnesses at a police station

Liam Hunt, 17, was brutally knifed four times and left to die in a pool of blood in an alleyway

Police were seen searching bins at the back of the restaurant near Northampton city centre following the death

Last week five men were convicted for their part in the youngster's death at Northampton Crown Court and will be sentenced at a later date.

Following the case, police released shocking CCTV showing the moments leading up to and after Liam's death.

Footage shows the thugs fleeing from the scene of the attack, burying a knife in a planter and even gleefully re-enacting the attack in the fast food restaurant.

One 17-year-old, who cannot be named, can be seen graphically gesturing to his neck as he mimics the attack on Liam.

Kane Allaban-Hamilton, 18, of Northampton, was found guilty of murder following a 12 week long trial last month.

Lee Warren, 18, of Northampton, Aaron Joseph, 21, of Waltham Forest, London, and a 17-year-old boy, who cannot be named, were all found guilty of manslaughter.

Last Friday, Derice Wright, 18, from Abington, Northampton, pleaded guilty to manslaughter.

On the day of the killing, the gang left the McDonald's in the Drapery, Northampton, and headed to St George's Street where Liam was smoking with his friends.

The fatal attack was not caught on camera but the group were caught sprinting from the scene.

Pictured from left to right is Lee Warren, Kane Allaban-Hamilton, Derice Wright and Aaron Joseph

A court heard Allaban-Hamilton stabbed Liam with such force his hand slipped onto the blade and inflicted a fatal seven-centimetre wound.

Joseph was accused of stabbing Liam in the leg and witnesses heard him shouting 'where's my t'ing, where's my shank' in the attack.

Warren - who threw a brick during the fight - phoned witnesses from prison and told them to change their stories to lessen his involvement.

The 17-year-old youth was accused of kicking Liam in the face as he hunched over from his stab wounds

Police were called to reports of the knife attack at a McDonald's branch in central London

Officers were seen searching bins at the back of the Northampton McDonald's after the horror attack

Wright was caught burying a knife in a planter as he and Allaban-Hamilton fled before the gang then regrouped in the same McDonald's.

Senior Investigation Officer Detective Inspector Phil Mills, of Northamptonshire Police, said: 'Liam was a young man, just 17-years-old, with his whole future ahead of him.

'Not only did he lose his life in a senseless attack, his murder has caused pain and suffering to his family and friends from which they will never fully recover.'