A man pulled out a knife in front of two people outside Sainsbury’s in Cowley Road.
Police said the man approached a 15-year-old boy and a 35-year-old man between 5.30pm and 5.50pm on Wednesday.
An argument broke out between Stockmore Street and Temple Street in which the man produced a knife, although he did not threaten anyone.
A member of the public intervened and the man with the knife left the scene.
Police are looking for a white man who is 6ft tall, of slim build, in his mid to late 30s with dark hair. He was wearing a red T-shirt and dark jeans. Call police on 101.
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