Police searching for missing 16-year-old Holly Whitmore and 21-year-old Brandon Cunningham believe the pair may have been in the London area in the last few days.
Efforts are continuing to locate Holly and Brandon and officers have appealed directly to Brandon and Holly to attend their nearest police station in order to confirm their welfare.
Brandon, who has a previous conviction for child abduction, went missing from his home in Corby on Sunday, September 2. Holly went missing from her home in Rushden on Saturday, September 8.
Officers believe Brandon and Holly, who are not a couple but are known to each other, may be together. Police have confirmed they are not treating it as an abduction case.
Brandon is white, 5ft 8ins, of slim build with blue eyes and brown hair.
Holly is white, 5ft 3ins, of slim build with brown eyes and dark hair dyed blonde.
Anyone with information can contact police on 101 or 999 in an emergency.