Climate change activists glued themselves to the top of a train in London on Wednesday in a third day of protests.

Two Extinction Rebellion members climbed on top of a carriage and super-glued themselves to the roof at Canary Wharf station in the capital's financial hub.

The man and woman, who were both dressed in smart office clothes, unfurled a banner that read "Climate Emergency – Act Now".

A third activist, wearing a black t-shirt and fluorescent yellow vest, stuck himself to the window of the commuter service.

Police had to use special tools to remove the protestors, causing delays to thousands of people trying to get to work.

It was the latest in a series of protests in London involving thousands of people since Monday in a bid to force the UK Government to tackle climate change.

Extinction Rebellion tweeted on Wednesday morning: "As dawn breaks on the third day of the rebellion, protesters have held on to all four of their locations.

"With police cells full, thousands more rebels willing to be arrested and hundreds joining daily, Government is increasingly feeling the pressure."

Scotland Yard said it has arrested more than 300 people over the last three days in connection with the campaigning, which has included blockades at major landmarks.

Marble Arch, Oxford Circus and Waterloo Bridge were all targeted, causing disruption to roads and bus services in the centre of London.

A bright pink boat has been parked in the middle of Oxford Street since Monday and a number of people attached themselves to lorries on Waterloo Bridge.

"Conditions remain in place on Waterloo Bridge and Oxford Circus meaning that protesters must continue any demonstrations at Marble Arch," Scotland Yard said in a statement.

"We are in the process of moving demonstrators on Waterloo Bridge. Those that do not comply may be arrested."

Extinction Rebellion, which has said that protests could continue for up to two weeks, has called on the UK Government to declare a climate and ecological emergency, reduce CO2 emissions to zero by 2025 and create a citizens' assembly to deal with global warming.

It said in a statement that protests are also being held in "at least 80 cities, in more than 33 countries". EFE-EPA