Sheffield’s biggest supermarket was evacuated of hundreds of shoppers and staff after a fire started in a nearby building.
Clouds of black smoke were seen to be rising above Asda at Handsworth at around 6.45pm on Monday.
Staff and customers were safely cleared as 30 firefighters manning appliances from Darnall, Mansfield Road, Elm Lane and Barnsley Central arrived on the scene.
The seat of the fire was discovered to be in a portable building which had been erected in the premises of a furniture warehouse in Richmond Park Road to the rear of Asda.
Thick smoke then spread to the Asda warehouse which is adjacent to the main supermarket.
Fire officers took the decision to evacuate the building as a precaution.
Handsworth Road was closed between Lavarack Street and the Sheffield Parkway as diversions were put in place - and the plume of smoke could be seen for several miles.
Trevor Wilson, a cutlery manufacturer who lives in a flat on Handsworth Road which overlooks the giant supermarket, said: “I was on my way home on the bus and could see the smoke.
“The driver wasn’t able to get down Handsworth Road so I had to walk from the Parkway roundabout.
“There were lots of fire engines there and I could see it was something major.
“I thought at first it must be the Asda but later I found out it was a portable cabin somewhere at the back that had gone up in flames.”
Firefighters were at the scene until 11.30pm. Nobody was injured in the fire.
The cause of the incident is being investigated.
Meanwhile, police are investigating after arsonists set fire to a garden shed in the early hours of yesterday.
The blaze was started in the outbuilding at a property in Osprey Gardens, Manor Park, Sheffield, at 4.55am. Two fire crews, one from Mansfield Road, the other from Central, attended.
And firefighters from Cudworth and Barnsley Central stations were called after a skip containing old tyres was set on fire deliberately.
The fire at a scrapyard in Boulders Bridge Lane, Carlton, near Barnsley, was started at 12.20am on Tuesday.
Police are investigating the cause.