A brief scuffle broke out at London's Royal Opera House after a performer unfurled a Palestinian flag during a show.
The incident took place during a performance of Il Trovatore on Saturday.
During the final night of the 11-night run of the show, a performer held up the flag on stage.
In video footage, shared online, someone backstage could be seen attempting to take it off the performer. The performer grabs it back following a brief scuffle.
A spokesperson for the Royal Ballet and Opera said: "The display of the flag was an unauthorised action by the artist.
"It was not approved by the Royal Ballet and Opera and is a wholly inappropriate act."
The reaction to the flag was mixed, with some people heard applauding and cheering, while another audience member was heard saying "oh my God".
One poster on X, who claimed to have been a member of the audience, said: "Extraordinary scenes at the Royal Opera House tonight.
"During the curtain call for Il Trovatore one of the background artists came on stage waving a Palestine flag. Just stood there, no bowing or shouting. Someone off stage kept trying to take it off him. Incredible."
Performers show support for Palestinians
A number of performers have shown support for Palestinians amid the Israel-Hamas war in Gaza.
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During Glastonbury Festival, numerous acts offered messages of support during their sets, including Kneecap, Bob Vylan, Wolf Alice, and Amyl And The Sniffers.
During her band's set, Wolf Alice singer Ellie Rowsell told the crowd at the Other Stage: "Whilst we have the stage for just a little bit longer, we want to express our solidarity with the people of Palestine.
"No-one should ever be afraid to do that."
Following their performances, both Kneecap and Bob Vylan faced investigation by Avon and Somerset Police.
Bob Vylan were widely criticised after leading on-stage chants of "death to the IDF" (Israel Defence Forces).
The performance was live-streamed by the BBC, sparking a backlash against the broadcaster - which later issued an apology.
The investigation into Kneecap was later dropped, with the police saying there was insufficient evidence to provide a realistic prospect of conviction for any offence".
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