A 28 year-old man has been arrested in Gweedore as part of an under cover garda operation.
As part of the investigation, a search yesterday morning uncovered guns and a quantity of ammunition at a house near Lunniagh
The arrest follows local reports of significant Garda Armed Support Unit activity in area in the past few days.
The man is being detained and questioned at Letterkenny Garda Station.
No further details are available at present.