A man who visited a police station in Herefordshire could hold vital information on the whereabouts of a missing South Yorkshire teenager.
Police said the man, who would not give his identity, went to Leominster Police Station claiming to have information about Andrew Gosden.
The 15-year-old ran away from his home in Doncaster on 14 September 2007.
When an officer arrived to take details, the man had left. Police are asking him to get in touch.
After withdrawing £200 from his bank account, Andrew took a train to London, where CCTV footage showed him at Kings Cross Station on 14 September. There has been no reported sightings of him since.
His parents Kevin and Glenys Gosden have already made numerous trips to London to try to find information on their son's whereabouts.
In October, charity Missing People said Andrew's face would be printed on cartons of milk sold by the Iceland supermarket in the hope it would help find him.
West Mercia Police said the mystery caller went to the station on Wednesday evening and used the outside intercom system.
When the officer arrived, he had disappeared.
Pc Adele Loney said: "If this man does have information about young Andrew, it is vital to the investigation that he makes contact with police again."