Police investigating a two-vehicle traffic accident in the Moneymore area on Friday (March 7) have arrested a 46-year-old man on suspicion of excess alcohol and dangerous driving.
It is understood that the police helicopter was drafted in, as part of the operation.
Police are making an appeal for witnesses to come forward.
Anyone who can help police with their enquiries is asked to contact them, quoting reference number 16770314, on 0845 600 8000.
Alternatively information about crime can be passed via the independent Crimestoppers number on 0800 555 111.