FIVE people have been arrested in connection with the blaze at Dalton Mills in Keighley.
West Yorkshire Police have confirmed that the fire, which has gutted the historic building, is being treated as arson.
LIVE: Updates as Dalton Mill fire battle in Keighley continues into new day
Emergency services were called to the mill, in Dalton Lane, at around noon yesterday.
No one was in the building at the time.
More than 20 crews from fire stations across the region tackled the blaze, and some firefighters remain at the scene damping down.
Bradford District CID says investigations are continuing and officers are appealing for anyone who may have seen anything suspicious between about 11.30am and noon to come forward.
They are also seeking drivers who were in the area at the time and might have dashcam footage.
Information can be given to Bradford District CID via 101 or the live chat facility at westyorkshire.police.uk/contactus, quoting crime reference 13220116901.
Alternatively, contact Crimestoppers on 0800 555 111.
Comments: Our rules
We want our comments to be a lively and valuable part of our community - a place where readers can debate and engage with the most important local issues. The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.
Please report any comments that break our rules.
Read the rules hereComments are closed on this article