An investigation has begun into a fire that badly damaged a factory in Corby in the early hours of Monday morning.
Fire crews were called to Guaranteed Asphalt on the Princewood Road just after 0400 GMT after night staff saw smoke coming from a storage unit on the site.
The building was evacuated.
It took five fire crews almost three hours to bring the fire under control.
Insurance assessors say severe damage has been caused to the storage area, which houses materials for roofing and road works.
They hope the factory will be back in operation for the New Year.