Police have raided squats in London linked to the G20 protests and detained dozens of people as they locked down the summit venue in a bid to prevent further violence.
Police burst into the two squats in central London on Thursday and rounded up 80 people in the hunt for protesters involved in Wednesday's riots, which saw about 4,000 demonstrators lay siege to the Bank of England.
One resident died during Wednesday night's violence after suffering a heart attack, with the authorities saying they came under attack while they tried to help him.
While a police spokesman said those detained in the raids who were not of interest would be released, officers policing the event made a total of 21 arrests on Thursday, including nine for violent disorder and four for possession of an offensive weapon.
Speaking outside one of the squats, Superintendent Roger Evans said: "There are all sorts of people inside: people with piercings, people without piercings, people with dogs - the sort of people you might expect to see at a pop festival."
Commander Bob Broadhurst, in charge of policing the G20, said officers were using their video footage of Wednesday's disorder to track down violent activists.
"Small groups of protesters intent on violence, mixed with the crowds of lawful demonstrators," he said.
"Some have been arrested already and officers will be looking to identify others through footage from evidence gatherers.
"However these were isolated incidents and despite missiles being thrown and officers requiring personal protective equipment, a level of safety and control was maintained."
The police said demonstrators rained a hail of missiles on officers trying to revive a dying man who collapsed at the protest site on Wednesday.
City resident Ian Tomlinson, 47, was on his way home from his job at a newsagent's. He suffered a suspected heart attack but officers had to move him away from the front line after bottles were thrown at them.
Thousands of people took to the streets for Wednesday's demonstrations, which descended into violent battles with riot police. Protesters smashed their way inside a Royal Bank of Scotland office, breaking through windows, hurling out office equipment and trying to set it ablaze.
Police made 86 arrests on Wednesday for a range of offences, including violent disorder, aggravated burglary, arson, bomb threats and possession of ammunition.
Four people so far have been charged with offences: three with possessing a bladed weapon and one with assault.
Police officers manned barriers and checkpoints along the security perimeter around the ExCeL exhibition centre in east London's docklands, where world leaders met to thrash out a common response to the financial crisis.
While people were allowed to demonstrate near the venue, there were no reports of violence.
A few hundred people protested outside, waving placards reading: "Why do we have to pay?", "We won't pay for their crisis" and "Jobs, not bombs".
"In the last few months, billions of pounds and dollars were thrown at the banks, whereas workers and people didn't get bailed out," demonstrator Manuel Reachetseder, an Austrian web designer, told AFP.
"Millions of people are losing their jobs worldwide and banks are getting bailed out. It doesn't make any sense."
Meanwhile a few hundred protesters, some dressed all in black and waving communist flags, returned to the Bank of England site, where they were again penned in by police.
And urban climber Alain Robert, dubbed the French Spiderman, scaled the outside of the Lloyd's Building in a protest about climate change, unfurling a banner warning of "100 months" to save the world.
Expecting demonstrations and disorder, Scotland Yard undertook a massive security operation to keep protesters at bay in the days around the G20 summit.
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