Emergency services are continuing to combat a blaze at the old Herdmans Mill in Sion Mills.
It's believed over 60 fire fighters and 9 appliances attended the scene earlier today, it's believed some remain there this evening.
The fire service were called shortly before 4 o'clock this afternoon and fire fighters spent the last number of hours trying to keep the fire under control.
The cause of the fire is not yet known.
No injuries have been reported.