Four men have been arrested over a video appearing to show anti-Semitic language being shouted from a convoy of cars in London.
Footage on social media showed a number of cars covered with Palestinian flags passing through a Jewish community in Finchley, north London.
Passengers could be heard shouting : "F*** all of them. F*** their mothers, f*** their daughters and show your support for Palestine. Rape their daughters and we have to send a message like that. Please do it for the poor children in Gaza."
The Metropolitan Police said four men have now been arrested on suspicion of racially aggravated public order offences.
A Scotland Yard statement said: "Officers investigating a video which appeared to show anti-Semitic abuse being shouted from a car in north London have made four arrests.
"Police received reports of people shouting anti-Semitic abuse from a car travelling within a convoy of vehicles through the St John's Wood area on the afternoon of Sunday, May 16.
"Enquiries were carried out and officers traced a car to the A40 in Hillingdon. The police helicopter was deployed and officers stopped the car at approximately 18:30hrs.
"Four men were arrested on suspicion of racially aggravated public order offences. They were taken into custody at a west London police station where they remain."
The footage, along with other incidents that have emerged following large pro-Palestine rallies over the weekend, has received cross-party criticism.
Prime Minister Boris Johnson said: "There is no place for anti-Semitism in our society.
"Ahead of Shavuot, I stand with Britain's Jews who should not have to endure the type of shameful racism we have seen today."
Labour leader Sir Keir Starmer described the incident as "utterly disgusting."
"Anti-Semitism, misogyny and hate have no place on our streets or in our society," he said.
"There must be consequences."
Referring to the video of the convoy, Housing and Communities Secretary Robert Jenrick said: "This, on the streets of London, is deeply disturbing.
"Vile, criminal hatred like this must not be tolerated."
In a statement Mr Jenrick continued: "Whatever your view of the conflict in Israel and Gaza, there is no justification for inciting anti-Jewish or anti-Muslim hatred.
"The incidents of anti-Semitism we have seen in recent days have been shameful.
"Some of the language used on marches this weekend and in posts on social media is intimidating, criminal and racist.
"We must not tolerate this vile, shameful hate in our country. These actions must stop."
Cabinet minister Michael Gove described another video appearing to show protesters shouting anti-Semitic abuse as "deeply concerning".
Mayor of London Sadiq Khan tweeted: "Hate crimes are inexcusable and have no place in our city. I've been in touch with the Met Police Commissioner about the appalling reports of antisemitic attacks this weekend.
"Londoners can expect to see high visibility police patrols, and the Met Police have been working closely with the Community Security Trust. My team and I will continue to monitor the situation closely."