A woman from Downpatrick is critically ill in hospital following an incident just before 1pm on Friday 2 December.
Police were alerted just before 1pm and an ambulance was rushed to the scene.
The woman, who has a young girl, is understood to be in a critical condition.
A man has been arrested and is currently in custody helping police in their inquiries.
If anyone has any information about this incident, please call the Police on 101 or phone independent charity Crimestoppers on