Police in London are out in force again Thursday as leaders of the G20 financial powers meet, bracing for more violence after clashes a day earlier.

Police made 86 arrests for violent disorder and aggravated burglary Wednesday, after nearly 4,000 anti-capitalists, environmentalists and others converged on the Bank of England. One man collapsed during Wednesday's protests and later died.

The focus of demonstrators' anger is expected to shift Thursday to the ExCel Centre in London's Docklands, where world leaders are meeting to address the economic crisis.

Police are patrolling barriers and checkpoints around the security perimeter, and turning away anyone without accreditation within an 800-metre radius.

There were no signs of anger as delegates arrived Thursday morning.

Another 100 police officers guarded the London Stock Exchange near St. Paul's Cathedral in the financial district, watching a smaller group of protesters who entertained journalists and photographers by playing a giant Monopoly game.

Meanwhile, an army of cleaners is now trying to remove all traces left over from what demonstrators branded "Financial Fool's Day." They're working at the Bank Tube station where vandalized statues, graffiti and political stickers are on almost every wall and slab of pavement.

At the Royal Bank of Scotland branch on Bartholomew Lane that was trashed by small groups of anarchists, wooden boards cover three plate glass windows shattered as protesters smashed their way in. Four City of London Police riot vans remain parked outside.

Officials said protesters threw bottles at emergency medical personnel as they tried to resuscitate a man who collapsed near the Bank of England Wednesday evening. The man was later pronounced dead in hospital.

It was not immediately clear what caused the man's death, but police said he likely died from a medical condition, although that would not be confirmed until after an autopsy.