The main Letterkenny-Derry road, the N13, is closed at Bridgend due to a road traffic accident.
The road is closed at The Three Flowers pub.
Diversions are in place via Culmore and Muff.
All traffic travelling to Derry from Bridgend is being diverted on to Whinhill Road (at 19th Hole Pub) to Birdstown Junction, to Muff and on to Culmore.
Traffic coming from Derry is being advised to divert to Culmore and on to Muff.