OPA-LOCKA (CBSMiami) – One person is dead Thursday after a 20,000 gallon with an unknown chemical exploded at a business in Opa-Locka.

Police received a call Thursday afternoon about a chemical spill at the American Vinyl Company, a building located behind the Opa-Locka Police Department.

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A 20,000 gallon tank with an unknown chemical, according to Miami-Dade Fire, over-pressurized and exploded. The explosion shot through the ceiling of the business and came back down, authorities said.

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Five workers who were exposed to the chemical were decontaminated. Two of the five were transported for further treatment.

“Hazmat technicians at Miami-Dade Fire have sampling tools that will monitor air quality in the area. They’ve done this and have identified that no other businesses or residents in Opa-Locka are in danger at this time,” said Michelle Fayed of MDFR.

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HAZMAT crews are investigating the situation.