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.
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