The retail giant's main warehouse was severally damaged by fire, forcing the fashion retailer to stop taking orders.
The fashion website has been offline since this morning (June 21) with a statement saying it would not be back up and running until the the extent of the damage was assessed.
A post on the Asos Facebook page said: “We experienced a fire in our warehouse tonight [Friday] 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."
More than 60 firefighters were called to put out the flames that spread from the second floor up through the five-storey building.
A spokesman for South Yorkshire Fire and Rescue said teams stayed on the site on Saturday morning to ensure remaining “hot spots” did not reignite.
He added: “At its height, the fire was tackled by 10 fire engines, an aerial ladder platform and a high volume pump.
“The warehouse was more than 60,000 square metres in size. The fire involved several floors of the building and fire crews worked hard to quickly bring the blaze under control.”
The cause of the blaze is being investigated.
We’ve had a fire in our warehouse & fortunately nobody’s hurt. We’re working on this now & hope to be back to normal in a day or so— ASOS (@ASOS) June 21, 2014
At 1AM there was still quite a lot of smoke coming from the fire at the ASOS warehouse pic.twitter.com/dHMfTFea0d— Mathew Hanley (@mathew_hanley) June 21, 2014