ARSONISTS torched a derelict mill in Horbury Junction.
Firefighters were called to the mill, on Dudfleet Lane, just before 3am last Saturday, July 9.
Police believe the fire was started deliberately and have appealed for anyone with information to come forward.
Crews from Ossett, Dewsbury and Wakefield stations attended.
Specialist equipment also had to be drafted in from Mirfield to help to tackle the blaze.
Anyone with information should contact West Yorkshire Police on 0845 6060606.
Alternatively, call Crimestoppers anonymously on 0800 555111.