Climate activists blockaded the London Stock Exchange by gluing themselves across the entrances.
Protesters from Extinction Rebellion attached themselves to walls and to each other at the financial centre in the City of London.
A group also climbed on to a Docklands Light Railway (DLR) train at Canary Wharf and held up banners.
Protesters at both locations were later removed, but police warned of disruption throughout the day.
Elsewhere in the City, temporary road blocks have been set up by activists at Bank and Southwark Bridge.
Others glued themselves together on Fleet Street outside the Goldman Sachs bank headquarters.
Extinction Rebellion is urging the government to “tell the truth” about the scale of the climate crisis, it wants the UK to reduce carbon emissions to net zero by 2025 and it wants a Citizens’ Assembly to oversee the changes needed to achieve that goal.
More than 1,000 people have been arrested since the protests began on 15 April.