We will use your email address only for sending you newsletters. Please see our Privacy Notice for details of your data protection rights.

Sign up fornow and never miss the top politics stories again.

The Congolese migrant approached the girl, aged 17, at Dortmund's main train station but she rejected him, witnesses said.

According to police the migrant then hit her in the face, breaking her nose, before a German man ran to help her.

The Good Samaritan from Kalkar was then hit the migrant, and was also knocked out by the blow.

Witnesses told officers they saw the girl trying to keep the man away from her.