The man, aged around 19, was arrested at the Paris landmark after brandishing a knife in front of tourists and security forces.
French embassy in Beijing advises nationals to be vigilant after stabbing, though unclear if linked to Paris shooting of Chinese national.
Suspect who shouted ‘Allahu Akbar’ is said by police to be an Egyptian visitor who arrived in France in January on a visa from Dubai.
Prosecutors say man, named as Sallah Ali, was carrying butcher’s knife and paper on which the Islamic State flag was printed.
Anti-terrorism police are hunting a bearded man, possibly of North African origin, who fled after attacking the soldier in a crowded train station.