UPDATED: A serious fire has ravaged part of an industrial site at Otley.
Firefighters were called out to Ashfield Works, off Westgate, at 6.30pm on Tuesday, October 13.
They found part of a large, derelict building alight, with its whole roof ablaze.
Engines from Rawdon, Otley and Cookridge were involved in fighting the fire overnight, along with an aerial appliance from Bradford.
The site was still being dampened down on Wednesday morning, while Invesitgations into the cause continued.
Rawdon Fire Station Watch Commander Rob Hart, however, suspects foul play.
He said: "We believe it was deliberately ignited although we haven't confirmed that yet.
"When the incident is closed, which could be at the end of today, then the cause of fire will be given in the report.
"This was a derelict building, about 80 metres by 20 metres, with about ten per cent involved in fire and all of the roof timbers.
"When we first got there - it was Rawdon and Otley to begin with - they managed to get some stop jets in pretty quickly which managed to stop the whole property from catching fire.
"It was the initial response that really stopped it from spreading.
"The aerial appliance, which uses a hydraulic platform, allowed us to get above the fire and pour vast quantities of water over it." Arson was also suspected to be behind a previous blaze at the site - see the photo above - in 2008.

*More information, with images, to follow.