The explosion occurred at a sludge concentration building at the Calumet Water Reclamation Plant at 430 East 130th Street. Three people are reportedly trapped inside the plant. Firefighters were seen rescuing one person from the building.
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WATCH: Firefighters rescue person after explosion at water plant
Firefighters rescue person after roof collapse at water reclamation plant
A spokesperson for the Metropolitan Water Reclamation District said injuries have been reported. The number and extent of the injuries is not known.
Chopper7HD flew overhead as firefighters searched the rubble as part of a search and rescue operation.
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The cause of the explosion is not known.
This is a breaking news story. Please check back for updates