Police accused of failing to do their job after protesters march unhindered calling for an 'intifada'

Police were called to investigate pamphlets distributed during the march praising the “extraordinary heroism” of Hamas terrorists.

The literature, which pledges to support Hamas “unconditionally”, was spotted at multiple stalls along the route, including in Parliament Square.

One video showed demonstrators chanting “Khaybar Khaybar, O Jews the army of Mohammed is coming”; a reference to the battle of Khaybar in 628 in which the early Muslims defeated Jewish tribes in Arabia.

One person also appeared to be holding an effigy of a dead baby.

Police issued an appeal for more information on two women over both incidents.

The Met said that officers “were deployed quite quickly to the place where the video was filmed but the two women weren’t there, or could not be found, when they arrived”.

Crossbench peer John Woodcock, the government’s adviser on political violence, told The Sun: “We must bring the perpetrators of this antisemitic crime to book and stand together to drive out the dark stain of Jewish hate that has reached too far into our communities.”

Tory MP Nigel Mills said: “The police should be making a stand and not relying on people on social media to tip them off.”

A Met Police spokesman said: “Officers have made 51 arrests at protests over the past three weekends. We’ve been clear over the last week that wherever possible we will police up to the line of the law.

“There will be some slogans and chants that are obviously lawful or unlawful, but there will be others that are the subject of intense public debate where different groups interpret the language used in different ways. It falls to the police to weigh up all these factors and to reach a clear position on how officers should be directed to respond.”

On the “river to sea” chant, they said: “It is likely that its use in a wider protest setting would not be an offence and would not result in arrests”.