Climate activists have 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.
More than 1,000 people have been arrested since the protests began on 15 April.
The group had previously said it would end its action later in the day, having previously blocked sites including Parliament Square and Waterloo Bridge.
City of London Police has warned that it is “likely the whole of the City will experience disruption” during the day.