Officers have said they are "convinced" there are people who know what happened to a 19-year-old who disappeared two decades ago in Ipswich.
Suffolk Constabulary has issued a fresh appeal after Luke Durbin went missing after a night out with friends.
The teenager, from Hollesley, was last seen in the early hours of Friday, May 12, 2006, and reported missing in the afternoon of Saturday, May 13.
20 years on, Andy Guy, from the unsolved case team, has now said he is convinced that there are people who know what happened to him but have not come forward.
The last sighting of Luke Durbin
Luke Durbin had been to work on Thursday, May 11, 2006, and travelled to his friend Alex's home in Woodbridge afterwards.
Leaving his motorbike and a backpack, which included his mobile phone, Luke went out with Alex and another friend, Zac.
Alex went home early and Zac lost touch with Luke after coming back from the bar at Zest nightclub, in Ipswich.
The next sighting of Luke was between 2.30am and 3am on May 12, at Ipswich railway station.
He then walked across town to Hawk Express taxi rank, but had no money for a cab and declined the offer of a mobile phone to call home.
The last confirmed sighting of Luke is on CCTV crossing Dogs Head Street in the direction of the bus station, at around 4am on Friday, May 12.
There was also a report of a possible sighting of Luke in Woodbridge between 11am and 2pm the following day (Saturday, May 13).
The report stated he had been seen in a dark blue Renault Megane being driven by a black male, near to the entrance of the Turban Centre car park on Quay Side, Woodbridge.
Police have received numerous other reports of possible sightings, all of which have never made a breakthrough in the case.
What was he wearing?
Luke is described as white, 5ft 10inches tall, of slim build, with short dark brown hair and blue eyes.
At the time of his disappearance, he was wearing a black or grey long-sleeved collared shirt and a purple and grey White Stuff sweatshirt.
He was also wearing "tatty-looking" faded denim jeans with some kind of motif on the side thigh area and grey chocolate brown suede moccasin-style shoes.
What do police think happened?
Around 10 minutes after the last verified CCTV sighting of Luke, a Volvo - the model of which was possibly a 440 - was captured driving in the area, which detectives believe was connected to people involved in the supply of drugs.
Police confirmed that it is now understood that Luke had become involved with drug-dealing linked to suppliers from Brixton in south London.
The leading hypothesis by police for the reasons behind Luke's disappearance is that if he owed those people money, he would be vulnerable and may have been abducted.
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“While we retain an open mind as to what may have happened to Luke, the nature of his disappearance and his links to drug activities lead us to believe that it is possible organised criminals were involved and his disappearance was retribution of some kind," Mr Guy said.
“Luke’s family have endured 20 years of uncertainty, living every day with the pain of not knowing what happened to him.
“I am convinced there are people locally who know what happened to Luke and have not come forward so far. I also believe that some of those spoken to by police previously have not fully disclosed all they know about Luke and events in mid-May 20 years ago.
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“Luke’s mum Nicki, has been relentless in her pursuit of the truth and has kept his name and this case firmly in the public eye over the past 20 years. This, along with efforts by the police, has generated a steady stream of information relating to Luke, which has been and will continue to be acted upon.
“I hope on this significant anniversary of the last sighting of Luke, those individuals who hold that vital information will now search their conscience and do the right thing and call us.
“We know that over time allegiances can change and people who may have previously felt unable or afraid to come forward may now feel differently. It is never too late to speak up and anything you tell us will be dealt with in strictest confidence.”
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Enquiries with over 100 people logged on Luke's mobile phone, chats with friends, family and work colleagues, media appeals by his worried family and extensive enquiries into his lifestyle and habits have been conducted.
Police have received numerous other reports of possible sightings, all of which have never made a breakthrough in the case.
In 2012, two people were arrested. One was on suspicion of murder and the other on suspicion of being concerned in the murder of Luke, but both men were released without charge.
Family begs for answers
Luke's mum, Nicki Durbin, said: "I am not interested in justice, I just want to know what happened to my son.
"As I fully know, so much changes with the passing of time, that must include the need to withhold information due to fear or misguided loyalty.
"Thank you to all the people who have found the courage to come forward with information.
"If you haven’t found that courage yet, I beg you to.
"If you were the driver of the Volvo or if you were a passenger in the Volvo, please come forward. "
Where to go with information
Anyone who believes they have information about Luke Durbin’s disappearance, is asked to contact the Joint Norfolk and Suffolk Major Crime Review and Unsolved Case Team as follows:
Major Incident Public Portal: Public Portal
Email: unsolvedcasereviews@norfolk.pnn.police.uk
Phone: 01953 423819
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