Images of a dark green vehicle, seemingly left outside the Crowne Plaza hotel.
The Place de la République had previously been evacuated in November 2015 after a false alarm sparked panic in the wake of the Paris terror attacks.
The Place de la Republic has been evacuated in central Paris
Bomb threat outside Paris financial court
Mon, March 20, 2017
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French police officers stand guard at a cordoned off area in front of the financial crimes court building (pole financier du tribunal de grande instance) following a bomb alert in central Paris on March 20, 2017
Map of Paris and Place de la Republique
The events in Paris comes just days after 22 men, women and children were killed by suicide bomber Salman Abedi, 22, after he blew himself up at the Manchester Arena after fans were leaving an Ariana Grande gig in the city.
Only last month a policeman was killed on the Champs Elysees in Paris, in what authorities are treating as a terror-related attacked.
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The attacker, Karim Cheurfi, 39, was killed at the scene.
An empty Place de la Republique in central France
A knifeman drew a machete on a group of soldiers after he was told he could not enter the Louvre Carrousel shopping centre with two backpacks on February 3.
Prime Minister Bernard Cazeneuve said the attack was "clearly of terrorist nature" but said that no explosives were found in the bags.
But the worst attacks to occur in Paris took place on November 13, 2015 when 130 were killed and hundreds of others were injured.
Place de la Republique is empty after being evacuated
A suicide bombing at the Stade de France stadium were followed by more explosions and shootings at popular bars and restaurants in Paris.
Three gunmen also opened fire at Bataclan concert hall and killed spectators who were watching the Eagles of Death Metal perform.