Next year it will be 100 years since the start of the World War I, a conflict remembered for the brutality of trench warfare and the use of chemical weapons. Today, France still has a store of those chemical weapons, bombs and shells retrieved from battlefields. But the older the munitions get, the greater the risk of accidental leaks.
Al Jazeera's Jacky Rowlands reports from northern France.
Source: Al Jazeera