A major blaze took hold at Headswood Mill yesterday morning, with eight fire engines called out to extinguish the flames.
Another fire crew attended the scene shortly before 8.30am today to bring the blaze under control after a “re-ignition”.
No-one was injured during either incident.
An SFRS spokesman said: "We were alerted at 9.39am on Tuesday, April 7 to reports of a fire within a commercial premise in Denny.
"Operations Control mobilised eight appliances to the town's Headswood Mill, where crews were met by a well developed fire.
"Crews extinguished the fire and left the scene after working to make the area safe.
"Firefighters were recalled to the scene at 8.27am on Wednesday, April 8 following reports of a re-ignition.
"Operations Control mobilised one appliance to the scene, where crews extinguished remaining hot spots before leaving the area.
"There were no casualties on either occasion."
Police have confirmed the cause is not suspicious.
A spokesman said: “Police were called around 9.45am on Tuesday, 7 April following reports of a fire within a shed in Denny.
“Officers assisted the Scottish Fire and Rescue Service and there were no injuries.
“The fire is not being treated as suspicious.”
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