House Speaker Nancy Pelosi lashed out at Facebook during remarks in London on Friday, accusing the social media company of enabling the Jan. 6 riot at the Capitol by failing to police extremist and conspiratorial content on its site.

In remarks at Chatham House, a London-based international affairs think tank, the California Democrat said the deadly riot at the U.S. Capitol, which delayed certification of the presidential election, was not “a failure of the Democratic democratic system in the United States.”