A 12-year-old girl walking with her friend suffered a sexual assault in Slough on Tuesday last week.
She was walking in Stoke Poges Lane with another girl at about 6.20pm when a man walking towards her touched her inappropriately over her clothing.
The offender continued on Stoke Poges Lane towards Slough.
He is is described as Asian, between 5ft 9ins and 5ft 10 ins tall, of stocky build and aged in his late fifties. He had a white beard which covered his cheeks but not his chin and was wearing religious dress which had a gold and blue diamond pattern.
A potential witness in a red Volkswagen hatchback pulled up to the victim after the offence and advised her to call the police.
Investigating officer PC Johanna Frater, of Slough Investigation Hub, said: "We would really like to hear from anyone who saw the man described.
"We would especially like to talk to the person who stopped to help the victim as they could also have vital information and may have seen what happened."
If you think you are a potential witness or you recognise the description of the offender phone 101 quoting the reference 43180209865."
If you would prefer to remain anonymous, you can contact Crimestoppers on 0800 500 111.
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