Mitcham 12-year-old Tia Sharp went missing from New Addington on Friday afternoon.
Anyone with information should call the incident room on 0208 721 4005 or Missing People on 116 000 quoting reference 12MIS025216.
The search in New Addington continues with hundreds of volunteers and police involved.
Tia's natural father believes she is still alive.
Police reveal new witness saw her leave gran's New Addington home
Police received 60 sightings but none confirmed as Tia
800 hours of CCTV must be watched by detectives