Families were evacuated from Disneyland Paris today, amid fears that a shooter on the loose in the theme park.

There were separate reports of gunfire outside a synagogue in the city's 19th district this morning, and another potential hostage situation at a pharmacy in Jaures.

Tensions are already high in the city following the deaths of 17 innocent people in a wave of terrorist attacks this week.

France's President has warned its citizens to remain vigilant in the wake of a brutal attack on the Charlie Hebdo magazine, the fatal shooting of a policewoman and a deadly showdown between a hostage-taker and police at a Jewish supermarket.

The French Defence Ministry has placed 500 extra soldiers on patrol around Paris to calm nerves in the wake of the attacks.

Interior Minister, Bernard Cazeneuve, said France will keep its highest possible security level in the greater Paris area.

Initial reports of a gunman in the theme park this morning conflicted with separate accounts that police were investigating a bomb threat.

And according to Le Parisien, a woman was arrested after shouting from her window that she was Hayat Boumeddiene, who's wanted in connection to the hostage drama which left five people - including the killer - dead in Vincennes yesterday.

The evacuation was eventually dismissed as a false alarm, as were reports of a potential shooting at a synagogue. 

At around 1pm, armed officers were called to rue Armand Carrel, Paris, following reports that a number of shots had been fired outside the Jewish place of worship.

Dozens of officers sped to the scene and the road was closed sparking concerns another terror attack was underway, following two days of violence in the city.

But police sources later told Le Figaro newspaper that the shots heard in the 19th arrondisment were in fact from firecrackers - adding a 'nervous' resident had called police.

There was a large police and military presence across the city today, with armed officers and soldiers patrolling public buildings and stations.

Rumours on social media that hostages were being held inside a pharmacy in Jaures, have also been rubbished. 

Meanwhile, hundreds of Parisiens have been laying flowers at the Jewish deli where four people were killed by convicted Islamist, Amedy Coulibaly, yesterday.

Dozens of armed policeman stood guard at an extended security area outside the Hyper Cacher store, as grief-stricken locals paid their tributes to the dead.