THE huge fire which engulfed a Leeds industrial estate last week is being treated as suspicious, police have said.
At its height on Easter Monday more than 100 firefighters attended the blaze at Hazel Products and Tradpak Recycling on Armley Road.
West Yorkshire Police sealed off nearby roads and evacuated a nightclub in the early hours due to concerns for the safety of revellers.
Smoke from the incident could be seen from across the city and subsequent pollution killed hundreds of fish in the Leeds and Liverpool Canal.
Police were unable to get access to the site for investigation for several days as firefighters remained at the scene to make sure it was safe.
But Detective Inspector Mark Swift, of Leeds CID, said preliminary inquiries suggested the blaze may have been started deliberately.
He said: “Officers have now been able to access the site and enquiries are ongoing.
“The cause of the fire has not yet been established but is being treated as suspicious.”
The fish population is expected to return to normal as pollution levels subside, the Environment Agency said.