British Prime Minister Keir Starmer has said chants of "death" to the Israel Defence Forces (IDF) at Glastonbury were "appalling hate speech" and urged the BBC to explain how the scenes were broadcast.
Punk duo Bob Vylan made anti-Israeli chants on the West Holts stage.
One of the members of Bob Vylan chanted "death, death, to the IDF" in a reference to the Israel Defence Forces.
Responding to the chants from Bob Vylan, Mr Starmer said there "no excuse for this kind of appalling hate speech".
British police have said they were considering whether to launch an investigation after performers at the festival made anti-Israel comments during their shows.
"We are aware of the comments made by acts on the West Holts Stage at Glastonbury Festival this afternoon," Avon and Somerset Police, in western England, said on X late yesterday.
"Video evidence will be assessed by officers to determine whether any offences may have been committed that would require a criminal investigation," the police statement said.
The Israeli Embassy in Britain said it was "deeply disturbed by the inflammatory and hateful rhetoric expressed on stage at the Glastonbury Festival".
Glastonbury Festival said it is "appalled" by the actions of Bob Vylan on stage, adding: "Their chants very much crossed a line and we are urgently reminding everyone involved in the production of the festival that there is no place at Glastonbury for antisemitism, hate speech or incitement to violence."
Culture Secretary Lisa Nandy has spoken to the BBC director general about Bob Vylan's performance, a UK government spokesperson said.
A BBC spokesperson said: "Some of the comments made during Bob Vylan's set were deeply offensive".
"During this live stream on iPlayer, which reflected what was happening on stage, a warning was issued on screen about the very strong and discriminatory language," the statement said.
"We have no plans to make the performance available on demand," it added.
Bob Vylan, who formed in Ipswich in 2017, have released four albums with their music addressing issues to do with racism, masculinity and class.
Kneecap performed after Vylan's set on the West Holts Stage with Mr Ó hAnnaidh exclaiming "Glastonbury, I'm a free man" as they took to the stage.
In reference to his bandmate's forthcoming court date, Naoise Ó Cairealláin, who performs under the name Moglaí Bap, said they would "start a riot outside the courts", before clarifying: "No riots just love and support, and support for Palestine."
In the run-up to the festival at Worthy Farm in Somerset, several British politicians called for the group to be removed from the line-up and Mr Starmer had said their performance would not be "appropriate".
During the performance, Mr Cairealláin said: "The Prime Minister of your country, not mine, said he didn't want us to play, so f*** Keir Starmer."
He also said a "big thank you to the Eavis family", adding "they stood strong" amid calls for the organisers to drop the band from the line-up.
Kneecap's frontman Liam Óg Ó hAnnaidh was charged with a terrorism offence last month for allegedly displaying a flag in support of Iran-backed militant group Hezbollah at a concert in November.
He has denied the charge.
