Climate change protesters have glued themselves to a train and blocked major London intersections on the third day of a civil disobedience campaign.

Three demonstrators were arrested after stopping Docklands Light Railway services at Canary Wharf station on Wednesday.

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Police begin to remove climate activists who glued themselves on top of a Dockland Light Railway train at Canary Wharf station in east London as part of the ongoing climate change protests in the capital on Wednesday April 17, 2019. The group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change. (Kirsty O'ConnorPA via AP)

Climate change protesters have glued themselves to a train and blocked major London intersections on the third day of a civil disobedience campaign.

Protestors block the roads in parliament square in London, Wednesday, April 17, 2019, with Big Ben's clock tower shrouded in scaffolding back right. The group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change. (AP PhotoFrank Augstein)

Demonstrators continue to block sites including Waterloo Bridge over the River Thames and the Oxford Circus and Marble Arch intersections. Many bus routes have been disrupted, to the frustration of commuters.

A boy plays football on graffiti drawn by protestors who blocked Waterloo Bridge in London, Wednesday, April 17, 2019, with the River Thames and the city on London in background. The group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change. (AP PhotoFrank Augstein)

A boy plays football on graffiti drawn by protestors who blocked Waterloo Bridge in London, Wednesday, April 17, 2019, with the River Thames and the city on London in background. The group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change. (AP PhotoFrank Augstein)

Police officers speak to protestors under a lorry, during a civic disobedience event to block Waterloo Bridge in London, Wednesday, April 17, 2019. The group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change.  (AP PhotoFrank Augstein)

Police officers speak to protestors under a lorry, during a civic disobedience event to block Waterloo Bridge in London, Wednesday, April 17, 2019. The group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change. (AP PhotoFrank Augstein)

A protestor on Waterloo Bridge reads a book as the road is blocked in London, Wednesday, April 17, 2019. The group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change. (AP PhotoFrank Augstein)

A protestor on Waterloo Bridge reads a book as the road is blocked in London, Wednesday, April 17, 2019. The group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change. (AP PhotoFrank Augstein)

Protestors sit on the road of the blocked Waterloo Bridge in London, Wednesday, April 17, 2019. The group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change. (AP PhotoFrank Augstein)

Protestors sit on the road of the blocked Waterloo Bridge in London, Wednesday, April 17, 2019. The group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change. (AP PhotoFrank Augstein)

Police have arrested more than 300 people since Monday during protests by the group Extinction Rebellion.

Police begin to remove climate activists who glued themselves on top of a Dockland Light Railway train at Canary Wharf station in east London as part of the ongoing climate change protests in the capital on Wednesday April 17, 2019. The group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change. (Kirsty O'ConnorPA via AP)

Police begin to remove climate activists who glued themselves on top of a Dockland Light Railway train at Canary Wharf station in east London as part of the ongoing climate change protests in the capital on Wednesday April 17, 2019. The group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change. (Kirsty O'ConnorPA via AP)

Demonstrators continue to block sites including Waterloo Bridge over the River Thames and the Oxford Circus and Marble Arch intersections. Many bus routes have been disrupted, to the frustration of commuters.

Lawyer Farhana Yamin, one of those arrested, apologized to public transit users. But she told BBC radio that "we need to take actions that are disruptive so everyone understands the dangers we're facing right now."

Protestors block the roads in parliament square in London, Wednesday, April 17, 2019, with Big Ben's clock tower shrouded in scaffolding back right. The group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change. (AP PhotoFrank Augstein)

Protestors block the roads in parliament square in London, Wednesday, April 17, 2019, with Big Ben's clock tower shrouded in scaffolding back right. The group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change. (AP PhotoFrank Augstein)

A boy plays football on graffiti drawn by protestors who blocked Waterloo Bridge in London, Wednesday, April 17, 2019, with the River Thames and the city on London in background. The group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change. (AP PhotoFrank Augstein)

A boy plays football on graffiti drawn by protestors who blocked Waterloo Bridge in London, Wednesday, April 17, 2019, with the River Thames and the city on London in background. The group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change. (AP PhotoFrank Augstein)

Police officers speak to protestors under a lorry, during a civic disobedience event to block Waterloo Bridge in London, Wednesday, April 17, 2019. The group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change.  (AP PhotoFrank Augstein)

Police officers speak to protestors under a lorry, during a civic disobedience event to block Waterloo Bridge in London, Wednesday, April 17, 2019. The group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change. (AP PhotoFrank Augstein)

A protestor on Waterloo Bridge reads a book as the road is blocked in London, Wednesday, April 17, 2019. The group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change. (AP PhotoFrank Augstein)

A protestor on Waterloo Bridge reads a book as the road is blocked in London, Wednesday, April 17, 2019. The group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change. (AP PhotoFrank Augstein)

Protestors sit on the road of the blocked Waterloo Bridge in London, Wednesday, April 17, 2019. The group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change. (AP PhotoFrank Augstein)

Protestors sit on the road of the blocked Waterloo Bridge in London, Wednesday, April 17, 2019. The group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change. (AP PhotoFrank Augstein)