An altercation between three teenage girls at North Beach led to one of them being punched in the face.
Police are investigating what happened during the clash at the East Arm of North Beach at around 20:10 on Thursday.
Guernsey Police is keen to speak with anyone in the area at the time who witnessed the altercation.
Anyone with information is asked to contact PC 17 Kusimo on 725111 or, alternatively, to call Crimestoppers anonymously on 0800 555 111.
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