Two men reportedly approached a 13-year-old girl in Seven Hills on Monday.
About 2.50pm, the girl was walking along Best Road.
Police said a man approached the child, but she kept walking and another man also approached her.
Both men then left and the girl continued walking towards Alice Street.
A dark-coloured car then stopped next to her.
The vehicle contained the two men she had just seen and three other men.
One of them left the car and walked towards her.
The girl then ran from the scene and contacted her parents.
Police would like to speak two men, both described as being of Indian sub-continental appearance and 170-180cm tall.
One is also described as about 30 and wearing a black T-shirt and a black jacket.
The other man was also described as being of slim build and wearing a red T-shirt and a black jacket.
Anyone with any information is urged to contact Blacktown police on 9671 9199 or Crime Stoppers on 1800 333 000.