A man has been arrested on suspicion of Grievous Bodily Harm in County Antrim.
A 28-year-old man was assaulted on Castle Street in Ballycastle at around 2.30 this morning.
He sustained a serious head injury and remains in hospital.
A 32-year-old was arrested and is in custody helping police with their enquiries.
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Anyone who was in the Castle Street area last night, at around the same time as the incident is urged to contact the police.
