"The anti-terrorist branch of the prosecutors office is dealing with the matter," the source added.
Coming just four days after the murder of British soldier Lee Rigby in London, the stabbing was immediately seen as a possible copycat attack.
The 25-year-old, patrolling as part of France's Vigipirate anti-terrorist surveillance plan, was injured in the stabbing around 6pm but would survive, the source said. He was reported to be from France's Fourth Cavalry regiment, based in Gap in the southern Alps.
Colonel Thierry Burkhard, military spokesman, said: "He has been wounded but his life is not in danger."
He was attacked in the Parisian business district of La Defense, inside the train station.
French daily Le Parisien cited police sources as saying the suspected attacker was a bearded man of North African origin about 30 years old, and was wearing an Arab-style garment under his jacket.
He ran away following the attack and has not yet been detained.
Pierre-Andre Peyvel, police prefect for the Hauts-de-Seine area, said the soldier had lost a considerable amount of blood but would survive, and was being treated in a nearby military hospital.
"The wound appears to be quite serious, but it's not life-threatening," he told iTele news television.
http://www.telegraph.co.uk/new...tabbed-in-Paris.html