A woman in her 60s is being treated for what gardaí called "life-threatening injuries" after a two-car collision in Co Donegal on Friday evening. Gardaí have appealed for witnesses to the road traffic collision on the N13 Letterkenny to Ballybofey road in the townland of Listillion, at approximately 5.05pm. The driver of one of the vehicles, a woman aged in her 60s, is being treated for life-threatening injuries at Letterkenny University Hospital. No other injuries were reported. The road remained closed overnight for a technical examination to be conducted by Forensic Collision Investigators and local diversions are in place. Gardaí are appealing for anyone with information regarding the incident to come forward. Anyone who was on the N13 at Listillion between 4.50pm and 5.15pm and who may have witnessed the incident should contact investigating gardaí. Officer can be contacted at Letterkenny Garda Station on 074 9167100, the Garda Confidential Line on 1800 666 111, or any Garda Station. Gardaí said investigations were ongoing.