A man was assaulted when he tried to intervene in an altercation between a man and a woman on York Terrace at 8am on Saturday.
Officers say they would like the public's help to establish the full circumstances surrounding the incident.
Anyone with information that might help should contact North Yorkshire Police on 101, select option two, and ask for Marie Williams, or email [email protected]
North Yorkshire Police reference number 12200099432 should be quoted.
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Information can also be passed on anonymously via Crimestoppers on 0800 555111.