Greenpeace activists arrived at BP in St James’ Square at 0200 GMT and encased themselves in specially designed containers to block all the building's main entrances. A team of climbers abseiled from the top of the building.
"BP is fueling a climate emergency that threatens millions of lives and the future of the living world," said Paul Morozzo, a Greenpeace activist.
"The science is clear - we must stop searching for new oil and gas if we want a liveable planet. BP must clean up or clear out," Morozzo said.No one from BP was immediately available for comment.