Officers investigating the disappearance of Alexander Sloley from Islington in 2008 continue to appeal for information.
Alex was 16-years-old when he went missing and police are today issuing an e-fit that shows what he might look like now.
When he went missing, Alex had little money, no wallet and no extra clothes to indicate he was planning to run away.
At the time of his disappearance Alex was described as a light skinned black male, 5ft 5ins tall, of medium build with striking blue eyes.
His family and friends have not heard from him since August 2008 and despite repeated appeals and inquiries, police have not been able to trace Alex.
He has not been spotted on CCTV and all possible sightings reported by the public have been investigated, but with a negative outcome.
Detective Constable Tom Boon of the Central North Command Unit, said: "It is now 11 years since Alex went missing. Although there is no evidence he has come to harm, with every month that passes we grow more and more concerned.
“I believe somebody, somewhere, knows something about Alex's disappearance.
“I would urge anyone who does, to do the right thing and contact police. Alex’s family have endured over a decade and uncertainty and heartache.
“Please, if anyone has information contact police and or missing people and help end this family’s nightmare.”
If anyone has information they should call the Central North Command Missing Person Unit on 07881 330963 or Missing People on 116000, or online at http://www.missingpeople.org.uk
Alternatively, call police on 101, or tweet @MetCC.