Police have two prime suspects for the double murder of best friends Rhona Schofield and Vikki Preston, the M.E.N. can reveal.
The 19-year-olds died side by side in an inferno at 23 King Street, Higher Broughton.
They were staying overnight at the terraced house when it was set alight.
Between 3.40am and 4.10am on Tuesday May 10, 2005, whoever was responsible got in through an insecure front door as the girls slept.
They set fire to a settee in a rear living room and an armchair in the front room. Both were foam-filled - within ten minutes the downstairs had reached temperatures of 1000 degrees centigrade, causing windows to blow out.
Vikki and Rhona, pals since their schooldays, died in a first floor bedroom overcome by toxic fumes.
No one has ever been charged with their murder, although five arrests were made in the past.
But the M.E.N. understands GMP have now identified two people - a man and a woman - as the main suspects.
Martin Bottomley, head of GMP's Cold Case Unit, said: "I believe there is a significant number of people who know the suspects and know they have done it. They need to step up and be counted.
"We understand the culture of fear and intimidation but we need people who know to come forward and right a wrong.
"It is now 14 years since Vikki and Rhona died, but we will never give up and are determined to put those responsible in the dock.
"The reward money of £50,000 remains available. Nothing can bring the girls back but there are people who can give their families the answers they deserve and justice."
Three years ago, the girls' heartbroken mothers, Doreen Schofield and Jacqueline Preston, made their first ever public appeal to catch the killers through the M.E.N.
The arson attack happened under the cover of darkness, on a deserted street where half the houses were boarded up ready for demolition. The street has since been pulled down.
Jacqueline, from Prestwich, described how the loss of her daughter Vikki was 'still raw' and she struggled with it on a daily basis.
Doreen has now moved to Yorkshire but said: "We have not moved away from 2005. Someone will say something eventually. It is just waiting for that time."
The killings left Rhona's father, Peter, a broken man. Rhona's sister, Jenni Moran, said: "He passed away in 2013, but we always say he died the day he went to identify Rhona’s body. He was never the same man. He was broken. It was the first time I saw him cry.
“We had to pick up the pieces as my parents crumbled. It was so difficult because the family was falling apart. Life was never the same. You tried to block it out, which is a terrible thing to say, but you had to cry and carry on. My dad never slept properly after it.
“As soon as my mum got an offer of a house in York my dad died. It was as if he had done his job - he had got her safe.”
At an inquest held in January 2007, the coroner, the late Jennifer Leeming, recorded a verdict of unlawful killing.
Describing Vikki and Rhona as 'two fine girls' she praised their relatives for stoically remaining in control as the horror of their final hours emerged.
Vikki left two sisters and five brothers, and since her death a sixth brother has been born. She grew up in the Broughton area, attending Grecian Street Primary and Albion High Schools.
Rhona had four sisters and a brother. Poignantly she had been a fire service cadet working with crews at Broughton Fire Station in Salford. It was crews from the same fire station who braved an inferno to carry her from the property.
Later, Rhona's funeral cortege would stop outside the station to a salute from crews.
Anyone with information can call GMP's Cold Case Unit on 0161 856 5961.
