An 18-year-old man has been arrested on suspicion of murdering Leonne Weeks, 16, who was found dead on a path in Rotherham.
London Taxi Watch
Taxi drivers are being asked to be the eyes and ears of the police by reporting crimes they see on London's streets.
A new project called London Taxi Watch hopes drivers will pass on information to Crimestoppers anonymously.
It is hoped that the nature of their job will enable taxi drivers to alert the authorities to suspicious behaviour.
Metropolitan Police Commissioner Sir Bernard Hogan-Howe said: "London's cabbies are the best in the world. With police officers they are there all hours, all weathers and all places. They can be our eyes and ears and help victims of crime."
Crimestoppers' London campaigns manager, Regan Hook, said the drivers could become "everyday heroes" by reporting crime.
"Cab drivers may be aware of crime perpetrators including those involved in vehicle-related crime or may have information and intelligence about other serious crimes," he added.
"They can invaluably help fight crime by contacting the charity anonymously and play a part in making London safer."
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