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Officials at Aberdeen Proving Ground in Maryland say a contractor died in an explosion and fire at a laboratory in the Edgewood area of the installation.

The proving ground’s fire department responded to a fire alarm and 911 call from the Medical Research Institute of Chemical Defense laboratory facility around 3 p.m. Saturday. APG spokesman George Mercer says the fire was quickly extinguished, but firefighters found the man dead.

Other workers were in the building at the time of the fire, but Mercer says no one else was injured. He says there is no threat to the rest of the post or the surrounding community. The incident is under investigation

APG is an Army research, development, test and engineering facility for weapons and equipment.