#JeSuisJuif began trending shortly after it was revealed a second siege was unfolding at a Jewish supermarket in Paris.
Two people are reported to have been killed after a gunman linked to the Charlie Hebdo murders and suspected of shooting dead a policewoman, took six people, including children, hostage.
We must stand by French Jews as we stood by French cartoonists and police #JeSuisJuif— Mark Ferguson (@Markfergusonuk) January 9, 2015
Police are at the scene Hypercasher Vincennes, a kosher store, in Porte de Vincennes in the east of the capital.
The Associated Press reports police have ordered all shops to be closed in the neighbourhood.
BREAKING: Police order all shops closed in famed Jewish neighborhood in central Paris far from attacks.— The Associated Press (@AP) January 9, 2015
The Board of Deputies of British Jews on Friday issued a statement in response to the latest incident.
This won't end today. France is at a crossroads now. I hope they make the right decisions. #JeSuisJuif— Eitan Kalmowitz (@ekalmowitz) January 9, 2015
It said it is “closely monitoring the situation in France where a number of hostages have been taken at a kosher supermarket in Paris.
“We are in close contact with our counterparts in France, the Conseil Représentatif des Institutions juives de France (Crif), and stand in steadfast solidarity with the French Jewish community at this difficult time.”
According to the Jewish Year Book, there are 380,000 Jewish people in Paris.
Last year, a record 3,270 French Jews emigrated to Israel — a 63% percent hike from 2012.
The Jewish Agency, which promotes emigration to Israel from the Jewish diaspora, estimates that figure could spike to 5,000.
The man at the centre of the latest siege to hit the French capital has been named as Amedy Coulibaly, 32, who officials believe is connected to the brothers behind the slaughter of 12 people at the satirical magazine on Wednesday.
Coulibaly is also said to have been responsible for the killing of a policewoman yesterday in the Parisian suburb of Montrouge.
Officials said the hostage-taker opened fire in the market before telling police who flooded the area: "You know who I am."
Police issued a photograph of Coulibaly and appealed for help tracking him down as part of the investigation into the "voluntary homicide" in Montrouge.
They are also attempting to trace Hayat Boumeddiene, a 26-year-old woman.
The latest incident means police and security forces are now locked in two separate hostage situations at the same time, with Charlie Hebdo attackers Said and Cherif Kouachi holed up in an industrial estate with a hostage in a town around 25 miles north of Paris.