A migrant gang left 12 people aged 13 to 42 injured after carrying out random attacks and hurling racist abuse in a German city, it has been reported.

Four teenagers - from Iran, Syria and Afghanistan - are said to have targeted passers-by in the Bavarian city of Amberg, Daily Mail reported.

Eyewitnesses claim a man was pushed down a flight of stairs while a 17-year-old was left needing hospital treatment for a head injury.

Germany's Interior Minister Horst Seehofer said he was 'dismayed' by the events in Amberg adding: 'If asylum seekers commit violent crimes, they must leave our country.'

he violence broke out at about 6.30pm on Saturday at Amberg station.

A 13-year-old, named as Nimo M was kicked in the stomach before his 29-year-old friend, landscape gardener Marco S. was hit in the face.

In another incident, a 17-year-old girl was branded a 'hooker', Bild reports, before her companions were struck in the face when they tried to intervene.

One eyewitness said a man was pushed down a flight of stairs at the train station.  

Another teenager described how racist abuse was hurled at a friend before three people in the group were chased and attacked.

A man who tried to help them was also beaten up, said the teenager, who needed hospital treatment for bruises and concussion.