A 44-year-old man was pinned against a wall and robbed of his mobile phone on the stairs in the Hines Meadow car park.
At about 7.15pm on Thursday, the victim was assaulted after he was approached by four teenagers.
One of the group grabbed the man and shook him, before taking his mobile phone and throwing it aside.
The victim picked up the phone, but was then pinned against a wall by the group before they took his phone again and left.
The first teenager is described as a white male, around 15 years old and had dark hair. He was wearing mostly dark clothing with a light top, and baseball cap. He was riding a bicycle.
The second is a black male, approximately 5ft 7ins, around 15 years old, of medium build. He was wearing a light grey hooded top, with a light-coloured top underneath and a light-coloured baseball cap. He had a small amount of facial hair.
The third is a white female, approximately 4ft 11ins, around 14 years old with shoulder-length blonde hair with dark roots. She was wearing a square-patterned scarf around her neck, a dark-coloured jacket and a dark skirt.
Investigating officer PC Tom Dorman, based at Maidenhead police station, said: “This is a serious incident in which the victim was fortunate to not be injured.
“I would like to remind members of the public who are victims of anti-social behaviour to contact us on 101 or, in an emergency, 999 and not to confront the offenders.
“Officers will be conducting patrols around the area so, if you have any concerns or information, please approach them.”
An 18-year-old man from Slough has been arrested on suspicion of robbery in connection with the incident. He has been bailed until December 21.
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