Shocking video shows the moment commuters on the Paris metro began an antisemitic chant, shouting 'f*** the Jews... long live Palestine... we are Nazis and proud'.
The 16-second clip captures the astonishment of one commuter filming as a group go back and forth with the chant.
It comes as French prosecutors open an investigation into a surge of instances of Stars of David being graffitied onto buildings across the capital and its suburbs.
Some 857 markings have been recorded since Hamas launched its incursion into Israel, France's interior minister, Gérald Darmanin, said on Tuesday.
France has seen more antisemitic attacks, ranging from graffiti to physical abuse and death threats, in the last three weeks than in the past year.