Police announced the decision on Monday afternoon after reviewing video footage and audio of both sets, which took place on Saturday.
It comes after the BBC said it regretted the decision not to pull the live stream for Bob Vylan’s Glastonbury performance, during which frontman Bobby Vylan shouted anti-IDF (Israel Defence Forces) chants.
The punk-rap duo have also had US visas revoked and been dropped by their US representative, United Talent Agency.
In a statement, Avon and Somerset Police said that after reviewing footage of both performances, further enquiries are required and a criminal investigation is now being undertaken.
“A senior detective has been appointed to lead this investigation,” a spokesperson said. “This has been recorded as a public order incident at this time while our enquiries are at an early stage.”
The force said the investigation will be “evidence-led and will closely consider all appropriate legislation, including relating to hate crimes”.
“We have received a large amount of contact in relation to these events from people across the world and recognise the strength of public feeling,” it added. “There is absolutely no place in society for hate.”
What happened?
During Bob Vylan’s set, the duo performed in front of a screen that showed several messages, including one that said Israel’s actions in Gaza amount to “genocide”.
Bobby Vylan also led chants of “death to the IDF”.
The set was live streamed by the BBC as part of its Glastonbury coverage, but has not been made available on demand.
Politicians including the prime minister have criticised the performance. Glastonbury organiser Emily Eavis said the chants “crossed a line” and that there was no place at the festival for “antisemitism, hate speech or incitement to violence”.
A BBC spokesperson said the broadcaster respected freedom of expression “but stands firmly against incitement to violence”.
They added: “The antisemitic sentiments expressed by Bob Vylan were utterly unacceptable and have no place on our airwaves…
“The team were dealing with a live situation, but with hindsight we should have pulled the stream during the performance. We regret this did not happen.”
Irish-language rap trio Kneecap were on stage afterwards. Before their appearance at the festival, there had been calls for Glastonbury to remove them from the bill – as rapper Liam Og O hAnnaidh (who performs as Mo Chara) is facing a terror charge, accused of displaying a flag in support of the proscribed group Hezbollah at a gig in London last November.
Glastonbury organisers kept them on the line-up, but the BBC chose not to stream their set live. An edited version was later made available on demand.
On stage, the band led chants of “f*** Keir Starmer”.
O hAnnaidh’s bandmate Naoise O Caireallain (Moglai Bap) said they would “start a riot outside the courts” for O hAnnaidh’s next appearance, before clarifying: “No riots, just love and support, and support for Palestine.”
Hundreds of people turned out in protest for his first court appearance earlier this month.
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