Just Stop Oil activists have sprayed orange paint onto the Home Office, MI5 building and the Bank of England as the group's daily protests continue.
The group said a total of six supporters covered the buildings at around 8.30am on Monday.
Activists also sprayed the headquarters of News Corp at London Bridge during their latest string of protests.
A Just Stop Oil spokesperson said: “We are not prepared to stand by and watch while everything we love is destroyed, while vulnerable people go hungry and fossil fuel companies and the rich profit from our misery.
Just Stop Oil protests continued on Monday morning
Just Stop Oil
The group said a total of six supporters covered the buildings at around 8.30am on Monday
Just Stop Oil
"The era of fossil fuels should be long gone, but the creeping tentacles of fossil fuel interests continue to corrupt our politics, government and media as they have for decades.
"How else do you explain a government ignoring sensible no-brainer policies like renewables, insulation and public transport, which would cut our energy bills and our carbon emissions, in favour of corrupt schemes to drill for uneconomic oil and gas at taxpayers’ expense?
"Well, we’re done with begging. We are acting to stop new oil and gas because it is the right thing to do.
"As humans, we have every right to protect ourselves and those we love.
"The Government has the power to end the disruption today by agreeing to stop new oil and gas.”
Scotland Yard said a number of people have been arrested following the incident.
“Officers responded quickly to all incidents and a number of people have now been arrested on suspicion of criminal damage,” the force tweeted.
It comes after drivers dragged protesters out of the way and a woman shouted that they were stopping her sick child from passing as Just Stop Oil activists blocked two roads in east London on Sunday.
Activists holding banners temporarily blocked traffic by sitting in Commercial Street and Hanbury Street, near Spitalfields Market, in Whitechapel at 12.15pm.
Police had moved them within an hour.
Protesters are demanding that the Government halts all new oil and gas licences and consents, but the stunt angered motorists.
A man and a woman were seen dragging demonstrators out of the way while a driver shouted that she had a sick child in her car and needed to get through.
