One of the six far-right militants, who allegedly burned 13 vehicles, later posted an open letter calling for tougher security in Mitry-Mory.
Charges against the 88-year-old man relate to Oradour-sur-Glane in central France where 642 people were murdered by SS troops in 1944.
In his New Year message to the nation, French president unveils plans for new agreement with employers in bid to reduce jobless total.
The European Commission has issued a 'reasoned opinion' to France and the UK to reduce 'excessive' tunnel transport charges, or face proceedings.
Lawyer overseeing case against former president for alleged abuse of frailty of Liliane Bettencourt denies reports he recommends dropping charges.