The memorial in Lyon bears the names of 44 children and 7 adults who were deported in 1944 from the Children's Home of Izieu in eastern France.
An event at a Jewish cultural center in Marseille drew protests and alleged threats – and snowballed into a public scandal in one of Europe's most change-resistant communities.
The British Jewish community's watchdog recorded a 30 percent increase over the the same period last year.
Jean-Luc Melenchon called it "totally unacceptable" to say that "France, as a people, as a nation, is responsible for this crime."
According to the National Antisemitic Crime Audit released by the Campaign Against Antisemitism, anti-Semitic crime in 2016 rose 44 percent from 2014.
At least 80 people were killed when fire swept through the low-income, high-rise Grenfell Tower apartment building in West London, which Nazim Ali called a "grotesque' comparison.
The move comes two months after Belgium's largest region, Walloon, passed similar legislation.
Britain's chief rabbi offered prayers and a local synagogue put out an appeal to help the victims in a blaze that has killed at least six, with many missing and feared dead.
Watchdogs and activists say authorities are covering up the anti-Semitic motivation behind a brutal crime.
The grandchildren of Holocaust survivors or of those who grew up behind the Iron Curtain, young European Jews are creating projects outside of existing communal structures.