A major disturbance in the Burnfoot area of Inishowen area is believed to have involved members of the Travelling community from Derry.
Several Garda cars rushed to the scene close to a bar in the Tooban area shortly before midnight.
Eyewitnsses said four units were dispatched form Letterkenny to back up their colleagues from Buncrana.
There was also a large Garda presence in the Bridgend area.
Gardai are liaising with their PSNI counterparts in Derry in what has been described as an ogoing operation.
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