The Metropolitan Police is to investigate a number of Labour members over potential antisemitic hate crimes.
Specialist officers will look into whether party members broke the law when making a series of offensive comments about Jews.
Cressida Dick, the Met Police commissioner, said she would ask hate crime experts to investigate after being presented with evidence of Labour members appearing to call for Jews to be murdered.
She told LBC: "We take hate crime very seriously.
"If somebody makes an allegation to us, absolutely we will take it seriously, we will scope it, we will see if a crime has taken place.
"I will pass this to my experts to deal with. We'll see if a crime has been committed."
It comes after the radio station was handed a dossier of antisemitism cases that were considered by Labour's disciplinary Disputes Panel.
They show people thought to be Labour members making a series of highly offensive comments about Jews.
In one post, a member wrote: "We shall rid the Jews who are a cancer on us all."
Referring to Jewish people as "devils" and suggesting the Red Sea would be an "ideal destination" for them, they added: "No need for gas chambers anyway as gas is so expensive and we need it in England."
Another person called for a Jewish MP to "get a good kicking".
A third wrote: "One cannot understand the state of the world without understanding Jewish power, and one cannot understand the nature of Jewish power until one understands the nature of Jewish thinking."
And a sitting Labour councillor was accused of inflicting "ten years of hell" on a child, including calling him "Jew boy".