One person was killed and four injured, one seriously, in a blast at the Marcoule nuclear site in France on Monday morning. 

Local officials said there was no risk of a radioactive leak after the blast, caused by a fire near a furnace in the Centraco radioactive waste storage site. National electricity provider EDF, which owns the southern French plant, said it had been "an industrial accident, not a nuclear accident".

Interior ministry spokesman Pierre-Henry Brandet said later there had been no leak of radiation, either inside or outside the plant. Officials said the injured workers were not contaminated by radiation, and the worker who died was killed by the blast and not by exposure to nuclear material. Marcoule was opened in 1955 and is one of France's oldest nuclear sites, though it has been extensively modernised.

All the country's 58 nuclear reactors have been put through stress tests in recent months, following the disaster at Japan's Fukushima nuclear plant which was hit by an earthquake and tsunami.