The main Derry to Belfast road is closed following a serious collision near Dungiven.
Two vehicles are believed to be involved in a head-on crash about two miles from Dungiven on the Glenshane Pass side of the town.
Emergency services are at the scene and police have closed the road in both directions between the Corick Road and Boviel Road junctions.
Traffic is being diverted away from the scene through Draperstown.
No further details are available.
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