A blaze at an Asos clothing warehouse in Barnsley is thought to have been caused deliberately.
Around 500 workers were evacuated safely from the premises in Park Spring Road, Grimethorpe, at 10pm last night.
Nobody was injured but fashion giant Asos has suspended its operations as a result of ‘substantial damage’.
At its height, the fire was tackled by ten fire engines and more than 60 firefighters from South and West Yorkshire.
Police have now launched a criminal investigation to establish the cause and are treating it as deliberate after initial investigations were carried out.
Investigating fire officer Simon Rodgers said: “The fire involved four floors of the warehouse and the blaze was contained in the area of origin by firefighters.
“Staff had a good evacuation process in place which assisted the emergency services and allowed the fire to be brought under control more quickly.”
The warehouse was more than 60,000 square metres in size and contained up to 10 million boxes of packaging.
A spokesman for Asos said: “We experienced a fire in our warehouse tonight and fortunately nobody was hurt.
“We understand there has been substantial damage but it’s too early to ascertain the extent.
“We will not be taking any orders in the meantime. Sincere apologies for the inconvenience.”
A fire service spokesman said: “Several floors have been badly damaged by the fire, though fire crews worked hard to quickly bring the blaze under control.”
Anyone with information about the fire should call South Yorkshire Police on 101, quoting incident number 1210 of Friday June 20.