A Christmas grotto manufacturer was one of three businesses hit by a "severe" fire on an industrial estate.
More than 70 firefighters were sent to Clearwater Industrial Estate, in Wolverhampton, on Tuesday evening.
Staff working at one of the companies on site - which include an archive service and a plastics firm - alerted emergency crews.
West Midlands Fire Service has said it thinks the fire was started deliberately.
Ettingshall Road was closed while crews dealt with the blaze, which caused part of a roof to collapse.
One unit was completely destroyed along with two vans.
West Midlands Fire Service said crews managed to contain the fire by about 02:00 BST and stop it spreading to two other businesses.
Fire investigators are at the scene to establish the cause while also checking CCTV, the spokesman said.
Nearby residents were initially warned to keep windows closed after fears were raised about asbestos. They were still being encouraged to do so on Wednesday because of smoke.