Climate activists brought central London to a standstill on Friday morning by abseiling off Tower Bridge.
Protestors from Extinction Rebellion abseiled off the landmark just after 7.30am, unfurling a green banner reading: 'End fossil fuels now', prompting police to close the bridge.
Protestors also released red flares.
The protest and the ensuing closure of the busy route caused long queues of traffic in the area on Friday morning.
The protest comes ahead of a planned day of 'mass participation' protests from Hyde Park this Saturday and follows several weeks of activity across the country by climate change protestors.
Just Stop Oil has been blockading oil facilities across the country, demanding that the government ends all new oil and gas projects in Britain.
The group said: “The action has taken place at the gateway to the City of London – the root source of fossil fuel funding in the UK – and on the eve of the April Rebellion which begins tomorrow at 10am in Hyde Park."
Groups have targeted the Kingsbury oil terminal in Warwickshire, as well as the Navigator oil terminal in Grays, Essex.
Warwickshire Police said on Thursday that more than 100 arrests have been made at Kingsbury oil depot, including for offences of criminal damage and going equipped, with all those detained currently in custody.
The force said in a statement: “A large policing presence remains in the area.
“We will always respect people’s right to peaceful protest but we are committed to taking action against those who break the law and significantly impact on the lives and livelihoods of others.”
Just Stop Oil said more than 400 activists have now been arrested over the protests, which began last week.
Extinction Rebellion has warned that its protests will be "more disruptive than ever".
The group's activities have sparked anger from some, with those caught up in the chaos at Tower Bridge on Friday branding them selfish.
Watch: Extinction Rebellion enters fourth day of protests at oil facility