Firefighters tackled a major blaze at a Mirfield car dealership on Saturday night.
Fire crews were called to the garage premises of Mirfield Prestige and West Riding Jaguar in Huddersfield Road at around 8.30pm.
Police closed a section of the main A644 between Doctor Lane and Stocks Bank Road as up to nine fire engines and emergency vehicles attended the scene.
Witnesses told the Examiner that it was believed the fire started on the forecourt, possibly in one of the motorhomes parked there.
The garage site was a petrol station some years ago and the flames set the old petrol station canopy alight and spread to the building.
The premises, next to Kenmore Caravans, are shared by car dealership Mirfield Prestige and West Riding Jaguar, which has the basement area below.
Police closed the scene but a badly fire-damaged motorhome could clearly be seen on the forecourt.
Local people reported hearing explosions, thought to be gas bottles.
Several people gathered on the roadside including David Bye, managing director of West Riding Jaguar, based at the premises for 11 years.
Mr Bye said a friend who lives nearby alerted him around 8.30pm and he rushed to the premises.
Clearly shaken he said his garage housed about half-a-dozen classic and race cars, some belonging to customers.
Samantha Wood, who lives across the road, was having a barbecue earlier and her children saw smoke. Minutes later a camper van was ablaze and gas bottles exploded, she said.