The Castleblayney to Lough Egish road is closed to clear an overturned lorry.
The single-vehicle incident occured this afternoon on the R181, near Tullynahinera.
The driver of the truck was safely removed by members of Castleblayney fire brigade.
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Gardaí remain at the scene and diversions are in place while they await a crane to clear the scene.
The road is expected to be closed for a number of hours.