A man was injured in a serious assault in Lawrence Hill.
The attack happened on Croydon Street, near the Bristol to Bath cycle path, at 4.45pm on Monday (August 10).
A witness said part of the cycling route was taped off on Monday and bloodstains were visible on the ground.
An Avon and Somerset police spokeswoman said: “On arrival, police found the victim, a man in his 40s from Bristol, had received a cut to his torso following an altercation with another man which took place close to the entrance to the Bristol to Bath cycle track.
“The offender ran off in the direction of Stapleton Road via the cycle path. This is thought to be an isolated incident.
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“The victim was taken to hospital for treatment for his injuries and has since been discharged.
“Police have conducted house to house enquiries and reviewed CCTV of the area.”
The offender is described as a black man in his late 30s, with a shaven head.
He is believed to be about 5ft 5in tall and was wearing a blue t-shirt, blue jeans and blue sports shoes, with a black backpack.
If you have information that could help police with their investigation, call 101 quoting reference 5220179997.