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Police have released a picture of a man they want to speak to after an attack in Friargate.
The attack dates back to 21 April when four people have attacked two people in the street around 4.50am.
Police say one victim got away but the other person was subjected to an attempted robbery.
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Three people have been arrested and Preston Police want to speak to a fourth person in connection with the investigation.
Police say they believe the man picture to be from the Heysham and Morecambe area and was visiting Preston at the time of the incident.
A 21-year-old man and a 21-year-old woman, both from Preston, have been arrested on suspicion of two counts of assault, violent disorder and robbery. Both are bailed pending further enquiries.
A third person, an 18-year-old woman from Morecambe, was arrested on suspicion of two counts of assault, violent disorder and attempted robbery. She is bailed pending further enquiries.
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