Climate change protesters have blocked roads across central London sparking traffic disruption.
Members of campaign group Extinction Rebellion parked a boat at Oxford Circus and blocked Marble Arch and Piccadilly Circus.
Protester Yen Chit Chong said: “This is our last best shot at survival.”
Three men have been arrested on suspicion of criminal damage after a glass revolving door at oil company Shell’s HQ in Waterloo was smashed.
Police have advised people travelling into London to allow extra journey time.