A man is in a critical condition in hospital following a serious road traffic collision which happened outside Letterkenny overnight.
A woman is also understood to have been injured in the two-vehicle crash occurred at Dooballagh between Letterkenny and Drumkeen shortly before 8pm.
Concerns have been voiced after reports of alleged reckless driving had been taking place in the area prior to the incident.
Gardai have confirmed that the road will remain closed until lunchtime today in order to facilitate a forensic examination later this morning.
Diversions are in place – traffic travelling from Ballybofey will be diverted at Drumkeen with traffic from Letterkenny diverted towards Glenaquinn.
The diversions are not suitable for HGVs which are asked to travel via Lifford.
Garda are appealing for any witnesses to the crash to contact Letterkenny Garda Station.