Residents within a three-mile radius of a fire in County Tyrone are being advised to keep doors and windows shut.
About 50 firefighters were tackling the blaze at a derelict building on Mill Avenue in Sion Mills on Saturday.
Nine appliances were sent to the site of Herdman’s Mill after the fire was reported at about 0800 BST.
Police said people living between Sion Mills and Strabane should take precautions because the blaze was producing a high volume of smoke.
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