The 14-year-old girl was walking along Turpington Lane at 3.25pm last Wednesday (January 14) when a man driving a silver saloon car pulled up beside her.
The man allegedly threatened her in an attempt to get her into the vehicle but two women waiting at a nearby bus stop by Brosse Way intervened.
The women verbally abused the man, telling him what they would do to him if he did not leave the girl alone.
The suspect then drove off towards Bromley Common.
A 26-year-old minicab driver was arrested on Friday (January 16) on suspicion of attempted kidnap.
He has been bailed until a date in mid-February.
Detectives are appealing to the women who intervened to come forward to help them with their enquiries.
Detective Constable John Farthing, of Bromley police CID, said: “We would like to trace the women who intervened and stopped this potentially escalating into a much more serious incident.”
Anyone with any information should contact Det Con Farthing at Bromley police’s CID on 101 or Crimestoppers anonymously on 0800 555111.