A double manhunt is under way after a 15-year-old girl was raped by two different attackers, including a man she flagged down for help, police said.

Detectives said the teenager was first assaulted in a secluded part of Birmingham's Witton railway station, near the Aston Villa football ground, some time between 7pm on Tuesday and 2am the following morning.

The victim had walked to the station with her friend, but is said to have been led away by a man who approached her.