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ST. LOUIS - Six people were hurt in a propane explosion Thursday evening at a trucking company just north of downtown St. Louis.

It happened in the 7300 block of Hall Street. Investigators say SAIA trucking employees were trying to switch out a propane canister on a forklift. They say it somehow resulted in the explosion.

One man was critically injured, suffering burns to a large portion of his body. Four out of the six people injured were taken to the hospital. Three of the four taken for treatment remain hospitalized in serious but stable condition.

Firefighters evacuated the business because they were concerned about secondary explosions since they weren't sure what hazardous materials they were dealing with at first.

A spokesperson for the St. Louis Fire Department says employees were switching out an empty propane tank on a forklift aboard a trailer, and when the full one was brought it, there was a leak and some sort of ignition source.

Six people are hurt after a propane explosion tonight at a trucking company.

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