Nineteen people have been arrested (at the time of this post) with some police and protesters sustaining injuries as thousands descended on the City, reported by BBC.
Police estimate there are currently 4,000 demonstrators in the City of London and have blocked off a number of streets.
"Just dropped in to the crowd at Bank. Seems rowdy and a little tense but no violence" TwitPic by @tombot18
Twitter users in London and other parts of the world speak about the current protest activities:
The_ILG (Undisclosed) I am at the protest march in the City of London, against the bankers. Look out for my placard on TV "Make love, not leverage!" stevedc (Cape Town, South Africa) My sister in London says that the G20 protest is getting out of hand. Guy smashed the windows for the Royal Bank of Scotland. Crazy stuff.. LastGriffin (Undisclosed) watching protest on streets of london
wondering if people in the usa are just as mad tinalouiseUK (England) Looking with others for ways to harness today's London protest into a mass that can work together - ideas? Robit11 (Undisclosed) Im In London Bad fights going on windows getting smashed protest i think find out live updates about london protest at www.skynews.com
Some UK and US citizens are opposed to the riotous behavior:
TheSourceress (Newbury, UK) Definitely not going into london for #RTU - sorry folks. Don't want to get stuck trying to get home amidst all the crazy protest carnage. bolish (New York) Amazed if not outraged for the G20's protest in London warrenfree (Tamworth, England) Don't understand why the great unwashed think trashing London is a good idea? Is there such a thing as a quiet protest?