A man has been punched to the ground and sprayed with an unknown liquid during a city assault. 

Emergency services were called to St Stephen's Street at around 11pm on November 4 after a man in his 50s was assaulted by a group of men and sprayed with liquid.

Another man in his 40s who attempted to intervene was also sprayed with the same liquid. 

The victims suffered skin irritation and reddening to the eyes.

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A number of people were around the bus stops at the time and police are keen for those people to come forward.

Anyone who witnessed the attack or who captured any footage should also get in touch.

They can contact PC Adam Smith of Norfolk Constabulary on 101 or at adam.smith@norfolk.police.uk quoting incident number 502 of November 4.

They can also contact Crimestoppers anonymously via 0800 555 111.