A 14-year-old was robbed by a gang of boys as he walked home from the Co-op on Tower Mews Neath Hill.
He was with his friend when he noticed the group following at 10pm on Friday while they walked along the redway, which runs past the park on Serjeants Green.
They were shouted at by the gang, who then threatened them and asked for their money and mobile phones.
An amount of cash was stolen before the offenders made their way back towards the shops.
The first offender is white, about 17-years-old, around 5ft 9ins tall and of a slim build. He was wearing a black hooded top that was pulled up so much that only his eyes were on show.
The second offender is white, between 16 and 18-years-old, around 5ft 7ins tall and of a large build. He was wearing a grey hooded top which was covering his face.
The third offender is white, around 18-years-old. He was wearing a hooded top with the hood up.
If you have any information please contact the independent Det Con Wendy Cissell via the Thames Valley Police Enquiry Centre on 101.
If you don’t want to speak directly to the police you can contact the independent charity crimestoppers anonymously on 0800 555 111 or online at crimestoppers-uk.org.
No personal details are taken, information is not traced or recorded and you will not go to court.