MELBOURNE, Australia — A meeting of top financial officials from around the globe opened Saturday against a backdrop of 3,000 marching protesters, some of whom turned violent, pelting police with stones, bottles and smoke grenades.

Some 3,000 protesters marched on a downtown hotel where the Group of 20 meeting of finance ministers and central bankers opened, but most of the violence appeared to center around a group of about 200 demonstrators dressed in white coveralls with red bandanas tied around their faces.

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