Firefighters were struggling to enter the building, uncertain about the chemicals they were dealing with.
Thirty employees were cleaning containers when there was a “flash explosion” from some type of chemical reaction.
The cause of the fire remains unknown. Everyone inside the building was evacuated.
This is the second fire in Pasadena in less than a week. On October 2, at least four people were injured during an explosion at a chemical plant. The plant employed over 300 workers and operated seven days a week. Investigators have yet to determine what caused the explosion.