An investigation has been launched into an early morning assault in Letterkenny.
The incident happened shortly after midnight at Fairgreen Park.
The female victim sustained serious head injuries as a result of the attack and was taken to Letterkenny University Hospital for treatment.
Gardai believe that a number of implements were used in what's been described as a sustained assault.
A man is currently in custody in relation to the incident.
There was also significant damage caused to a front door panel as a result of the attack.
Gardai are appealing for witnesses - anyone with information is being urged to contact then at Letterkenny Garda Station.