Ten gangland shootings remain unsolved in Scotland.
Police say the cases remain open, with detectives dedicated to bringing those responsible to justice.
The drug war between Glasgow crime clans the Lyons and Daniel families are linked to six of the incidents, the Daily Record reports.
Four of the 10 are underworld assassinations, with the execution of Glasgow gangster Frank McPhie among them. The 51-year-old was gunned down outside his home in Maryhill on May 10, 2000, when he was targeted by a sniper from the eighth floor of a neighbouring building.
READ MORE: Glasgow gang cops probe 70 turf war crimes linked to Lyons and Daniel bloodshed
McPhie, who was cleared of two murders, was an associate of crime kingpin Arthur Thomson and spent stints behind bars for robbery in 1986 and drugs in 1992.
Tony McGorvern survived a shooting in Kenmure Crescent, Bishopbriggs on June 21, 2000, but despite wearing a bullet proof vest, he was killed at the New Morven bar, Balornock a few weeks later.
On October 6, 2008, George Redmond, 42, was repeatedly shot in the back outside The Waldorf pub in Glasgow by a hitman, believed to be from Belfast
.
The assassin fired nine shots from a stolen Porsche Cayenne, killing Redmond and injuring his friend, John Maguire, who spent eight days in hospital.
Before he was targeted, Redmond was linked to extortion, drug dealing and a string of violent attacks on rivals. The pair were nicknamed the Pulp Fiction Crew, after the Quentin Tarantino movie.
Detectives believed the killing was linked to a life-threatening knife attack Redmond carried out on David "Mincey" McKenzie in a pub in Glasgow's Duke Street in 2006.
Mincey - who was jailed for six years and eight months in 2013 for his involvement in transporting a £1 million cocaine -shipment - is one of Scotland's most notorious underworld figures, with links to European and Northern Irish crime syndicates.
On January 13, 2010, Daniel mob enforcer Kevin "Gerbil" Carroll, 29, was executed by two masked gunmen in a hail of 13 bullets in the car park of an Asda store in Robroyston. He had been responsible for a series of savage underworld kidnappings where he and his associates tortured rivals for their drugs, guns and cash.
They were nicknamed the Alien Abduction Gang because their victims told police they couldn't remember anything.
One of Gerbil's killers was a lieutenant in the rival Lyons gang. William "Buff" Paterson, 42, was jailed for 22 years over the killing in 2015. Convicted cocaine dealer and key Lyons associate Ross Monaghan, 40, was cleared over Gerbil's murder at a 2012 trial.
Daniel crime clan associate William Barclay was seriously injured in a March 2018 assassination attempt in Dykemuir Street, in Springburn. Two men opened fire but missed, chased him down in a 4x4 and butchered him with a machete.
The year before, he walked free on a not proven verdict over the May 2015 gangland attempted murder of Mark Bristow, who was paralysed after being knocked down then shot at point-blank range in Royston.
In February 2019, William's brother Jamie was shot in the stomach and leg in the same Springburn street, after his motor was rammed by hitmen in a Transit van.
Gangland shooting victim Brian Hughes, 25, was blasted in the back by a pint-sized balaclava-clad shotgun-wielding hitman on March 12, 2020, in Glasgow.
Fake cigarette kingpin Kamaran Khader, who headed a £28 million cigarette smuggling ring, cheated death in a botched murder bid in Greenock on May 12, 2020.
Khader, 40, ducked for cover as a shooter opened fire and struck a parked car before fleeing.
Scaffolder Brian McIlear was targeted in the street outside his home in Barony Drive, Baillieston, on January 14 this year. The 31-year-old, who was in a relationship with Mincey's daughter Emma, 29, was left covered in blood after being shot.
A police spokesman said: "If anyone has new information, we urge them to get in touch with us on 101 as any new details we receive will be fully considered."
Detective Chief Inspector Brian Geddes, from Homicide Governance and Review, added: "Homicides are significant crimes which go to the heart of public confidence in policing and police legitimacy.
"The investigation of homicides is an area where the national police service has driven high standards of investigation and compassion. The ability to respond professionally and thoroughly, and provide answers for families is a core duty of policing.
"Each death is unique and a tragedy for the individual and their family, with every investigation presenting its own challenges. We understand how devastating it is for loved ones to never know why a homicide happened or who may have been responsible and therefore our undetected murder cases are never closed.
"We have a team who keep these inquiries under review to ensure all new lines of inquiry are progressed. This could be from new information or a new investigatory technique that emerges which may help identify a killer or a cause."
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