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
More people are struggling to get through to their GP on the phone, new research has revealed.