London police say they are preparing for outbreaks of disorder during G20 protests amid concerns that anger at the economic crisis could spill over into violence.
The Metropolitan police force says it is concerned that new coalitions between anarchists, environmental and anti-capitalist groups are aiming to wreak havoc as world leaders gather.
A repeat of the violence that marred Mayday protests in 2001 would embarrass Gordon Brown, the UK prime minister, as he welcomes 19 heads of state to discuss measures to deal with the economic crisis.
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