At 16:37pm yesterday, West Yorkshire Fire and Rescue Service (WYFRS) were called to a report of an explosion at a warehouse in Parry Lane, Bradford.
On attendance, it was found that part of the building had collapsed, causing two employees to be temporarily trapped. The employees, two women aged 19 and 35, were taken to safety and treated for shock at the scene.
A total of 40 people were led to safety from adjoining premises.
The cause of the explosion is still being investigated, but is not believed to be suspicious at this stage.
Urban search and rescue dogs were deployed to the scene, as well as a structural engineer to assess the stability of the building.
Fire crews from Bradford and Odsal attended the incident along with Technical Rescue Units and Support from Cleckheaton.
A full investigation into the cause will be carried out in due course.