Transport links in east London have been disrupted after violent clashes broke out Thursday morning between Extinction Rebellion activists and commuters.
A dramatic footage showed commuters dragging an activist from the roof of a London Underground train.
"Arrests have already been made and officers are working to quickly resume services," the police said in a statement.
Extinction Rebellion launched a wave of protests on October 7 to highlight the risks posed by climate change.

Russian strikes kill 16 in Ukraine's Kyiv
Prince Harry and Meghan to move back to Britain
North Korea launches 10 ballistic missiles as US-South Korea drills near end
Kenya tourist helicopter crash kills seven
US, South Korea to cut length, scope of military drills after Trump order
