A fallen tree is causing tailbacks on the Warrenpoint Road.
It's closed in both directions between Drumsesk Road and the Shore Road.
Police say diversions are in place.
Warrenpoint taxi driver Joe Kelly told Q Radio it took him an hour and twenty minutes to make a two-mile trip:
Call for tougher firearm checks to tackle violence against women in NI
Hilary Benn defends £50 million NI defence deal after Michelle O’Neill criticism
NI ‘probably’ worst in western Europe for cancer wait times – committee chairman
Police restraint did not lead to death of man, coroner finds
Man who stole Noah Donohoe rucksack says he ‘never met or saw’ schoolboy