A 15-year-old boy was taken to hospital after a gang attacked him in a Knowle shopping centre.
Three men attempted to steal the teen's bike and coat before fleeing Broadwalk Shopping Centre at about 5.40pm on Saturday, December 19.
The victim suffered bruising and cuts to his head, and required hospital treatment.
Officers at Avon and Somerset police have now launched an investigation and are urging witnesses to come forward.
A force spokesman said: "Officers are investigating an attempted robbery that happened in a Bristol shopping centre last month.
"CCTV enquiries are being carried out and we’d like to hear from anyone who may have footage showing the incident.
"Anyone who witnessed what happened should call 101 and give reference 5220284254."
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