A major fire in Londonderry is expected to continue on into Monday, the Fire Service has said.
The fire broke out at the former Brickklin site on the Heather Road on Saturday just before 6pm.
Police described it as a "major fire".
Motorists were urged to avoid the area as traffic was hampering getting water to the scene and the thick smoke blanketing the area was making driving conditions hazardous. Nearby residents were also told to close windows.
"The fire involves a large shed containing large volumes of waste material. The shed and waste material - internal and external to the shed - are fully involved in the fire," said Fire Service group commander William Johnston.
At its height almost 60 firefighters attended the scene. There was said to be no risk to the public but given the quantity of material on fire - thought to be in the region of hundreds of tonnes - fire crews could not commit to entering the site until it was safe to do so.
"Crews worked very hard to bring it under control. We are still on the scene but have scaled down the operation and there are now two pumping appliances and 26 personnel remaining with the incident likely to continue on into Monday," Mr Johnston continued.
He said difficulties in accessing the site and the deep seated nature of the fire meant it was slow work in bring the fire to an end.
He said that as the fire was continuing and given the scale of the operation there was not year an indication of how it started.