An underground laboratory belonging to the French national radioactive waste management agency was evacuated after a collapse killed one person and injured another.
The department of Meuse, 225km east of Paris, said preliminary information indicated that the face of a wall collapsed on Tuesday during a geophysical survey.
It added that authorities were trying to verify the stability of the area.
A technician from French construction company Eiffage was killed and another lightly injured by the collapse, a spokeswoman for Meuse said in a statement.
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