Jasmyn Chan, who died following a hit-and-run collision in Sheffield this morning, has been described as "an active, friendly girl".
Paying tribute to the 14-year-old, Chief Inspector Stuart Walne said: "Jasmyn was an active, friendly girl who was very giving.
"This situation is even more upsetting as the driver didn't stop at the scene."
He added: "The driver may not have intended to cause this collision nor are they likely to have been aware of the extent of the injuries they caused last night.
"However I would urge them to think about the impact on Jasmyn's family, friends and community and please come forward."
He said that investigating officers are working on a number of leads and that people have been giving the police information.
A 12-year-old girl who was seriously injured during the incident is being treated in hospital.
More top news
A cat owner has spoken of his joy at being reunited with his beloved moggy - whose unique cross-eyed condition means he often gets lost.
The 17-year-old, who cannot be named for legal reasons, must pay the billionaire £100 after sending a series of anti-semitic tweets.
Andrew Taylor and Timmy Donovan set upon PC Neil Doyle after spotting him on a Christmas night out.