A crash has led to the closure of part of the main Derry to Strabane road.
The collision happened a short time ago just past Newbuildings on the road out of Derry.
Eyewitnesses say that at least three police vehicles and one ambulance are at the scene.
It is not known how many vehicles were involved or the extent of any injuries.
Motorists are being diverted away from the area.
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