A FIRE which swept through an Accrington music shop on Sunday destroyed more than £100,000 of stock.
Firefighters are treating the blaze, which started at 2.34pm and spread to two nearby properties, as suspicious.
They are investigating the cause and said specially trained sniffer dogs had not detected any accelerants.
They believe the blaze started inside the building on Abbey Street in the ground floor lobby. Earlier reports claimed the fire started in a stairwell between the premises and an adjoining property on Water Street.
Mr Dunn said: "At the moment it is being treated as a suspicious fire because we can't find any legitimate cause. We have had fire investigators out there and there weren't any traces of accelerants."
The music shop's roof and first floor showroom were badly damaged.
Water from the firefighter's jets also flooded the storage basement of the premises.
Brian Grooby, a part owner of the shop who has helped run it for 25 years, said he was greeted by total devastation as he surveyed the damage with officers.
Many of the instruments had suffered smoke damage while others had been completely destroyed.
Watch manager Tony Hartley said:"We are still investigating but we suspect that somebody caused a small fire that got out of control.
"It's looking like somebody has possibly not deliberately tried to set fire to Music Box but it's something that has spread.
The alarm was raised after a CCTV operator spotted plumes of smoke pouring form the roof of the building.
Parts of Abbey Street and Water Street were closed off as firefighters fought to bring the fire under control and make the area safe.
Accrington police are asking for any witnesses who may have seen anything unusual around the time the fire started to contact them on 51212.