The Metropolian Police have confirmed there are currently no suspects in the search for a missing 12-year-old girl in south London.
Officers have been redirected from Olympic duties to make up a team of more than 80 searching for Tia Sharp.
Metropolitan Police area commander Neil Basu, whose son once went missing in what he described as the "worst two hours" of his life, said: "I can't imagine how it must feel for this family after five days."
Tia vanished on Friday afternoon after telling relatives she was going to the Whitgift Centre in Croydon town centre.
Police believe she was last seen at her grandmother's house in New Addington, south east London.
Mr Basu said: "We have collected more than 800 hours so far of CCTV footage from buses, trams, and we have viewed more than 120 hours of that," stressing the investigation remains a missing persons inquiry.
Searches have covered a 500m radius around Tia's grandmother's house, including woodland, garages, lock-ups and a local school, he added.