The investigation into a fatal Dumpster fire in December is expected to conclude by the end of April, authorities said. Firefighters were fighting a fire inside the Dumpster outside a manufacturing company when it exploded, killing one firefighter and injuring eight others. Authorities are planning another test they want to run before the end of April, which they expect will be the last part of the investigation.

Authorities do not know what caused the fire, but they said the explosion was caused by a combination of water from the fire hoses and a burning container of metal byproducts in the Dumpster. The fire has been ruled accidental. Officials said that 17 firefighters were within 50 feet of the Dumpster when it exploded.

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