UPDATE: 15:46
Gardaí say no injuries have been reported.
Officers are currently at the scene and are managing traffic.
Earlier:
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Emergency services are dealing with a crash on the M9 motorway.
The two-car collision happened southbound between junctions 8 and 9.
One lane of the motorway is closed, but traffic is still moving.
Gardai and the ambulance service are at the scene.
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The extent of any injuries is not yet known.