Just Stop Oil protesters have invaded the stage during the first night of the Proms at the Royal Albert Hall.
The environmental group tweeted: “The pair set off confetti cannons and sounded air horns, demanding the UK government immediately halt all new oil and gas consents and licences.
“They attempted to address the audience before being forcibly removed.”
The pair were booed as they were bundled off stage within moments of unfurling orange banners, social media footage showed.
Just Stop Oil said the protesters were Kate Logan, a 38-year-old mother of two, and Pia Bastide, a 29-year-old community worker – both from London.
The group wants the government to stop licensing all new oil, gas and coal projects and has tried to disrupt numerous high-profile events to highlight its cause.
Confetti and jigsaw pieces were thrown on the court at Wimbledon last week, while England cricketer Jonny Bairstow carried off a protester at the Ashes in June.
Orange powder was also thrown on a table at the snooker world championship, while the Chelsea Flower Show was targeted in May.
Two members of the group were jailed for more than two and a half years earlier this year after climbing the bridge at the Dartford Crossing in October.
New powers to crack down on activists came into force this month.
They give police new rights to move static protesters, such as those who attach themselves to objects or sit in the road.