The company was reportedly operating in a ground-plus-two-story building where cloth dyeing work was carried out. The sudden fire engulfed the entire building, causing panic in the area.
Thane Fire Brigade Department responded to scores of rescue calls in the last 24 hours, said Thane Municipal Corporation, adding that the department received two fire calls and 42 incidents of tree falls were reported.
Four fire engines were rushed to the spot and brought the fire under control. Thane Municipal Corporation said that the four people injured in the incident are undergoing treatment in a hospital.
The three-storey building collapsed in the Bhiwandi area in Maharashtra's Thane district on Saturday afternoon trapping several people under the debris.