Firefighters are trying to establish the cause of a blaze which led to the closure of part of the M25 and the Dartford Crossing for an entire day.
Smoke could still be seen 24 hours after the fire broke out
Traffic was still being delayed on Monday afternoon after the fire at the Eagle Global Logistics warehouse on the Dolphin industrial estate in Purfleet.
It broke out on Sunday morning, shutting the Dartford tunnel, bridge and several junctions of the M25.
Essex Police said the fire had caused major traffic problems in the area.
Smoke billowing across the M25 was a hazard to drivers
A 27-mile diversion was in place on Sunday because smoke from the fire was making driving conditions dangerous along the M25.
More than 40 firefighters struggled to contain the incident, which started shortly before 0900 GMT.
Nearly half the roof of the building collapsed and it was still well alight two hours later.
On Monday, Essex Police spokesman Roger Grimwade said structural damage was making it difficult for fire crews to attack the heart of the blaze.
He said the warehouse stored all sorts of things from perfume to game consoles.
"There is a real cocktail mix inside the factory," he said.
It is expected that firefighters will be damping down at the scene for the next two days.