French police were deployed to the France monument, Champs-Elysees, after a bag of ammunition was discovered near the Eiffel Tower on Thursday night.
The area was briefly evacuated as police searched for evidence, according to local reports.
France is currently on high alter after a teacher was beheaded by an 18-year-old man earlier this month.
Following news of the latest incident, French President Emmanuel Macron tweeted: “It is France which is under attack. “I have therefore decided that our soldiers will be more mobilized in the coming hours.
The Avenue des Champs-Elysees is an avenue in the 8th arrondissement of Paris, France, 1.9 kilometers long and 70 meters wide, running between the Place de la Concorde and the Place Charles de Gaulle, where the Arc de Triomphe is located.