A 22-year-old woman has been killed in a one vehicle crash in Crossmaglen, Co Armagh.
The collision happened on the Newry Road at around 3.30am on Sunday.
A 25-year-old man has been arrested on suspicion of a number of motoring offences and is currently in custody assisting police with their enquiries.
Anyone who was travelling on the Newry Road and who witnessed the collision is asked to contact police in Newry or the Collision Investigation Unit on the non-emergency number 101.
The Newry Road was reopened on Sunday afternoon.
SDLP councillor Geraldine Donnelly said the tragic crash further illustrated the need for safety measures on the road.
"This tragic accident and subsequent loss of life is particularly moving considering the girl involved was only twenty-two years of age," she said.
"My sincerest condolences go out to her family at this time of tremendous grief and pain.
"Her boyfriend, who was with her at the time of the accident, has been taken to hospital and today my thoughts go out to him and his family too."
She added: "This is further illustration, although not needed, that the B30 road is dangerous and needs attention from road service. The SDLP has been lobbying for many years to make this point and we have seen little progress so far.
"The B30 needs to be prioritised as a road that requires attention in order to avoid situations like that which occurred last night."