A graffiti artist sprayed a can of beer over a man who followed him, police said.
Officers have now released an image of the man they want to speak to in connection with the alleged assault.
Wiltshire Police said a member of the public saw a man spraying graffiti on a property behind Goddard Avenue at around 5pm on May 8.
The man, 60s, followed the spray can artist who threw a can of beer over him.
The force said: "He wasn’t injured fortunately, but was left extremely shocked.
"If you can help identify the person in the picture, please call us on 101."
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