A man has been left shaken following an armed robbery in Horsham.

The victim, a man in his 20s, was approached from behind by someone in an alleyway by the train station car park shortly after 1 o’clock Friday morning.

The offender tripped him and, whilst the victim was lying on the floor, produced a shiny object thought to be a knife or screwdriver.

The victim was ordered to hand over his mobile phone and the suspect ran off once he had it in his possession.

The suspect is described as a white teenager around 15 years old, approximately 5’10’’ tall and of slim build.