[cnn-photo-caption image=http://i2.cdn.turner.com/cnn/2009/images/04/01/g20.protests.art.jpg caption="Thousands protest at Bank of England ahead of G-20"]
Happening now on CNN's American Morning:
LONDON, England (CNN) - Thousands of anti-capitalists, anarchists, and environmental campaigners gathered outside the Bank of England on Wednesday to make their voices heard a day before the G-20 summit in London.
Police estimated there were as many as 4,000 people at the scene. Aerial footage showed the streets filled with people, with lines of luorescent-yellow-clad police in the crowd.
Eleven people were arrested for being in possession of police uniforms, a police spokesman said. They had earlier been stopped while riding in an armored personnel carrier near Bishopsgate, near the Bank of England, and the vehicle will now be examined by police, the spokesman said.
Protesters occasionally lunged forward against the police line, and one masked protester hit out at polices with a long black pole. One police officer was whisked to the side after apparently being hit. Police held their line and occasionally pushed protesters back with their hands.
Protesters carried banners that read "Arrest the War Criminals," "One Currency, One Country, One World," and "Capitalism Isn't Working."