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:
Education Authority boss hits out at criticisms of public services
Man in 90s dies following Co Down road crash
Police to increase patrols after second incident of shots being fired in Belfast
Woman charged over theft of campaigner’s car ‘must stay out of Belfast’
Bluetongue restrictions in Northern Ireland will be relaxed from Friday