Drone footage of Sunday's fire at a warehouse at Drayton Fields Industrial Estate has been released by Northamptonshire Fire and Rescue Service.
The footage, filmed on Monday, shows the building still alight with crews still at the scene.
At its height, more than 50 firefighters were tackling the blaze. Crews remain at the scene and are expected to be on site for the remainder of this week.
The fire started on Sunday night. A man previously arrested on suspicion of arson has been released on bail pending further enquiries.
Anyone with any information about the fire can call Northamptonshire Police on 101.